CN115206243A - Pixel circuit, display panel and display device - Google Patents
Pixel circuit, display panel and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- 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
- G09G3/3258—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 voltage across 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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
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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
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Abstract
The application discloses a pixel circuit, a display panel and a display device. The pixel circuit comprises a driving module, a data writing module, a light-emitting control module and a leakage compensation module; the data writing module is used for writing the data signal into the control end of the driving module in the data writing stage; the light-emitting control module is used for controlling the light-emitting module to emit light according to the driving current output by the driving module according to the signal on the light-emitting control signal line; and the leakage compensation module is connected between the compensation voltage end and the control end of the driving module and is used for coupling the jump voltage of the compensation voltage end to the control end of the driving module in the light-emitting stage so as to compensate the voltage leaked by the control end of the driving module. According to the embodiment of the application, the stability of the control end potential of the driving module can be improved, and the display effect is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a pixel circuit, a display panel and a display device.
Background
Organic Light Emitting Diodes (OLEDs) are one of the hot spots in the research field of Display devices, and compared with Liquid Crystal Displays (LCDs), OLED Display panels have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, and fast response speed, and at present, OLED array substrates have begun to replace the conventional LCD array substrates in the Display fields of mobile phones, PDAs, digital cameras, and the like.
The OLED display panel is provided with a pixel circuit to drive the OLED light emitting element, and the pixel circuit may include a driving module, however, the control end potential of the driving module is unstable, which affects the display effect.
Disclosure of Invention
The embodiment of the application provides a pixel circuit, a display panel and a display device, which can improve the stability of the control end potential of a driving module and improve the display effect.
In a first aspect, an embodiment of the present application provides a pixel circuit, where the pixel circuit includes a driving module, a data writing module, a light emitting control module, and a leakage compensation module; the data writing module is used for writing the data signal into the control end of the driving module in the data writing stage; the light-emitting control module is used for controlling the light-emitting module to emit light according to the driving current output by the driving module according to the signal on the light-emitting control signal line; and the leakage compensation module is connected between the compensation voltage end and the control end of the driving module and is used for coupling the jump voltage of the compensation voltage end to the control end of the driving module in the light-emitting stage so as to compensate the voltage leaked by the control end of the driving module.
Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a display panel including the pixel circuit as in the embodiment of the first aspect.
Based on the same inventive concept, in a third aspect, embodiments of the present application provide a display device including the display panel as in the embodiments of the second aspect.
According to the pixel circuit, the display panel and the display device provided by the embodiment of the application, through adding the leakage compensation module, the leakage compensation module can couple the jump voltage of the compensation voltage end to the control end of the driving module in the light-emitting stage to compensate the voltage leaked by the control end of the driving module, so that the voltage leaked by the control end of the driving module can be compensated for the control end in a compensation mode, the voltage leaked by the control end can be reduced or even counteracted, the stability of the voltage of the control end of the driving module is favorably maintained, and the phenomenon of flicker of the light-emitting module caused by the current change of the driving module when the light-emitting module emits light is improved.
Drawings
Other features, objects, and advantages of the present application will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 illustrates a schematic structural diagram of a pixel circuit provided in an embodiment of the present application;
FIG. 2 is a timing diagram of a pixel circuit according to an embodiment of the present disclosure;
fig. 3 is a timing diagram of a control terminal and a compensation voltage terminal of a driving module of a pixel circuit according to an embodiment of the present disclosure;
fig. 4 is a timing diagram illustrating another timing diagram of a control terminal and a compensation voltage terminal of a driving module of a pixel circuit according to an embodiment of the disclosure;
fig. 5 is a schematic diagram illustrating another structure of a pixel circuit provided in an embodiment of the present application;
fig. 6 is a schematic diagram illustrating another structure of a pixel circuit provided in an embodiment of the present application;
fig. 7 is a schematic diagram illustrating another structure of a pixel circuit provided in an embodiment of the present application;
fig. 8 is a schematic diagram illustrating another structure of a pixel circuit provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of a display panel provided in an embodiment of the present application;
FIG. 10 is a timing diagram of the control terminals and the compensation voltage terminals of the driving modules of the multi-row pixel circuit in the display panel according to the embodiment of the present disclosure;
fig. 11 shows a schematic structural diagram of a display device provided in an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is 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 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 phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The term "connected" may mean "electrically connected" or "not electrically connected through an intermediate transistor". The term "driving" may refer to "controlling" or "operating". The term "portion" may refer to "local". The term "pattern" may refer to a "member". The term "end" may refer to either an "end segment" or an "end edge". The display panel may be a display device or a module/portion of a display device.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the corresponding claims (the claimed subject matter) and their equivalents. It should be noted that the embodiments provided in the embodiments of the present application can be combined with each other without contradiction.
Before explaining the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically explains the problems existing in the related art:
the OLED display panel has many advantages of self-luminescence, fast response, high brightness, light weight, and the like, and has gradually become the mainstream of the display field. The OLED display panel is provided with a pixel circuit to drive an OLED light-emitting element, the OLED light-emitting element is driven by current, and the pixel circuit can comprise a driving module which can generate driving current according to the potential of a control end of the driving module. However, the inventor finds that when the light emitting element emits light, the control terminal of the driving module leaks electricity, and the driving module cannot generate stable driving current due to the fact that the potential of the control terminal of the leakage driving module is no longer stable, so that the light emitting module flickers; especially, the display panel operates at a low refresh rate or low brightness, which causes a problem of a flicker of the display panel.
In order to solve the above problems, embodiments of a pixel circuit, a display panel, and a display device are provided, and the embodiments of the pixel circuit, the display panel, and the display device will be described below with reference to the drawings.
The pixel circuit provided by the embodiment of the present application is first described below.
Fig. 1 shows a schematic structural diagram of a pixel circuit provided in an embodiment of the present application. As shown in fig. 1, the pixel circuit 10 may include a driving module 11, a data writing module 12, a light emitting module 13, a light emitting control module 14, and a leakage compensation module 15.
The data writing module 12 may be connected between the data line data and the first terminal of the driving module 11. The driving module 11, the light emitting control module 14 and the light emitting module 13 may be connected between the first power line PVDD and the second power line PVEE. The leakage compensation module 15 may be connected between the compensation voltage terminal V0 and the control terminal of the driving module 11.
The operation of the pixel circuit 10 may include at least a data writing phase and a light emitting phase.
The data writing module 12 is configured to write the data signal on the data line data into the control terminal of the driving module 11 in a data writing phase.
In the light emitting stage, the driving module 11 can generate a corresponding driving current according to the potential of the control terminal thereof. In addition, in the light emitting phase, the light emitting control module 14 may be configured to control the light emitting module 13 to Emit light according to the driving current output by the driving module 11 according to the signal on the light emitting control signal line Emit.
The compensation voltage terminal V0 is capable of outputting a jump voltage at least in a light emitting stage, and the leakage compensation module 15 is capable of coupling the jump voltage of the compensation voltage terminal V0 to the control terminal of the driving module 11 in the light emitting stage to compensate a voltage leaked from the control terminal of the driving module 11. For example, in the absence of the leakage compensation module 15, the voltage at the control terminal of the driving module 11 is decreased, and the compensation voltage terminal V0 is capable of outputting a voltage jumping upwards at least in the light emitting stage. For another example, in the absence of the leakage compensation module 15, the voltage at the control terminal of the driving module 11 increases, and the compensation voltage terminal V0 is capable of outputting a voltage that jumps down at least in the light-emitting phase. For example, taking a time period in the lighting phase as an example, the jump voltage output by the compensation voltage terminal V0 may be: the difference between the voltage value corresponding to the compensation voltage end V0 at the end time of the time period and the voltage value corresponding to the compensation voltage end V0 at the start time of the time period. For example, the voltage value of the compensation voltage terminal V0 at the end of a certain time period of the light emitting phase is 0.15V, the voltage value of the compensation voltage terminal V0 at the start of the time period is 0.1V, and the transition voltage output by the compensation voltage terminal V0 in the time period is 0.05V (0.15V-0.1V = 0.05v).
The light emission control module 14 may include a first light emission control module 141 and a second light emission control module 142. The first light emission control module 141 is connected between the first power line PVDD and the first end of the driving module 11, the second light emission control module 142 is connected between the second end of the driving module 11 and the first pole of the light emitting module 13, and the second pole of the light emitting module 13 may be connected to the second power line PVEE. The control ends of the first light emitting control module 141 and the second light emitting control module 142 may be both connected to the light emitting control signal line Emit. In the light emitting phase, the first light emitting control module 141 may transmit a signal on the first power line PVDD to the first terminal of the driving module 11 according to a signal on the light emitting control signal line Emit. In the light emitting phase, the second light emitting control module 142 may transmit the driving current output by the driving module 11 to the light emitting module 13 according to the signal on the light emitting control signal line Emit.
According to the pixel circuit provided by the embodiment of the application, through newly adding the leakage compensation module, the leakage compensation module can couple the jump voltage of the compensation voltage end to the control end of the driving module in the light-emitting stage to compensate the voltage leaked by the control end of the driving module, so that the voltage leaked by the control end of the driving module can be compensated for the control end in a compensation mode, the voltage leaked by the control end can be reduced or even counteracted, the stability of the voltage of the control end of the driving module is favorably maintained, and the phenomenon of flicker of the light-emitting module caused by the current change of the driving module when the light-emitting module emits light is improved.
As an example, the jump voltage value of the compensation voltage terminal V0 and the voltage value dropped by the control terminal of the driving module 11 may be equal in the light-emitting period and in the unit duration. In this way, the dropout compensation module 15 can compensate for a voltage equal to the voltage dropped by the control terminal of the driving module 11.
For example, a compensation circuit capable of generating a voltage corresponding to the compensation voltage terminal V0 may be provided, and an output terminal of the compensation circuit may be connected to the compensation voltage terminal V0, or an output terminal of the compensation circuit may serve as the compensation voltage terminal V0. The specific structure of the compensation circuit is not limited in the present application.
As an example, continuing to refer to fig. 1, the pixel circuit 10 may further include a first initialization module 16, a threshold compensation module 17, and a second initialization module 18. The first initialization module 16 may be connected between the initialization signal line Vref and the control terminal of the driving module 11. The threshold compensation module 17 may be connected between the control terminal of the drive module 11 and the second terminal of the drive module 11. The second initialization module 18 may be connected between the initialization signal line Vref and the first pole of the light emitting module 13.
Illustratively, the first power line PVDD is used to provide a power supply voltage, and the voltage on the first power line PVDD may be a positive voltage, such as 4.6V. The voltage on the second power supply line PVEE may be a negative voltage, such as-2.5V. The initialization signal line Vref is used to provide an initialization voltage signal, and the voltage on the initialization signal line Vref may be a negative voltage, such as-3.5V.
As an example, the control terminal of the first initialization module 16 may be connected to the first scan line S1. The control terminals of the data writing module 12 and the threshold compensation module 17 can be connected to the second scan line S2. The control terminal of the second initialization module 18 may be connected to the third scan line S3.
The effective pulse on the third scan line S3 may be a signal pulse that controls the conduction of the corresponding functional module before the effective pulse on the emission control signal line Emit. As an example, the signal of the third scan line S3 may be the same as the signal of any one of the first scan line S1 and the second scan line S2. The signal of the third scan line S3 is the same as the signal of the second scan line S2.
As shown in fig. 2, the operation process of the pixel circuit 10 may include an initialization phase t1, a data writing phase t2, and a light emitting phase t3. The first initialization module 16 is configured to initialize the potential of the control terminal of the driving module 11 in an initialization phase t 1. The threshold compensation module 17 is configured to capture a threshold of the driving module 11 in the data writing phase t2 and write the threshold into the control end of the driving module 11. The second initialization module 18 may initialize the first pole of the light emitting module 13 before the light emitting period t3. For example, the second initialization module 18 may initialize the first pole of the light emitting module 13 in the data writing phase t 2.
In the initialization period t1, the potential of the control terminal of the driving module 11 is initialized to be the same as the initialization signal line Vref, for example, the voltage transmitted by the initialization signal line Vref may be a negative voltage, and then the potential of the control terminal of the driving module 11 is initialized to be a negative potential in the initialization period t 1.
The voltage of the data line data is Vdata, the threshold voltage of the driving module 11 is Vth, and the potential of the control terminal of the driving module 11 is Vdata- | Vth | in the data writing stage t 2. It can be understood that, since a certain time period is required for writing data, the potential of the control terminal of the driving module 11 can gradually become Vdata- | Vth | in the data writing phase t 2.
Ideally, for example, when there is no leakage at the control terminal of the driving module 11, the potential at the control terminal of the driving module 11 should be stabilized at Vdata- | Vth | during the light emitting period t3. But there is a leakage condition at the control terminal of the driving module 11. The inventor also finds that, as shown in fig. 3 or fig. 4, in the absence of the leakage compensation module 15, the voltage of the control terminal of the driving module 11 is gradually decreased in at least a part of the lighting phase t3 as a whole, and this is not intended to limit the present application, which is illustrated in the present drawing in which the voltage of the control terminal of the driving module 11 is gradually decreased in the lighting phase t3 as a whole.
For example, the control terminal of the driving module 11 is connected to the node N1, and the voltage of the control terminal of the driving module 11 is the same as the voltage of the node N1. In fig. 3 and 4, the solid line indicates the voltage waveform of the N1 node, the voltage waveform of the N1 node is the same as the voltage waveform of the control terminal of the driver module 11, and the dotted line indicates the voltage waveform of the compensation voltage terminal V0. In addition, fig. 3 and 4 only illustrate the voltage waveforms of the compensation voltage terminal V0 in the light-emitting phase t3, and the voltage waveforms of the compensation voltage terminal V0 in the initialization phase t1 and the data writing phase t2 are not limited in the present application.
In some alternative embodiments, at least during the light-emitting period t3 of the pixel circuit, the voltage output from the compensation voltage terminal V0 may gradually increase. Because the voltage output by the compensation voltage end V0 is gradually increased in the light-emitting stage, it can be understood that the light-emitting stage is divided into a plurality of shorter time periods, each time period can compensate for a small voltage to the control end of the driving module 11, that is, the voltage compensation can be performed on the control end of the driving module 11 in the light-emitting stage in different time periods, which not only can compensate for the voltage leaked from the control end of the driving module 11 in the light-emitting stage as a whole, but also can avoid suddenly compensating for a larger voltage to the control end of the driving module 11, which affects the overall stability of the control end of the driving module 11 in the light-emitting stage, thereby further improving the flicker problem of the light-emitting module.
The inventor also found that, as shown in fig. 3 or fig. 4, without the leakage compensation module 15, the voltage waveform of the control terminal of the driving module 11 has an arc-shaped trend decreasing in the light-emitting period t3. In order to better compensate the voltage dropped from the control terminal of the driving module 11, in some alternative embodiments, as shown in fig. 3, at least during the light-emitting period t3, the waveform of the voltage signal at the compensation voltage terminal V0 may be correspondingly curved.
As an example, after the waveform of the voltage signal of the compensation voltage terminal V0 in the light-emitting period t3 is horizontally inverted, the inverted waveform may coincide with the voltage waveform of the control terminal of the driving module 11 in the light-emitting period t3 without the leakage compensation module 15.
As yet another example, the lighting period t3 may include several time periods, and in any one same time period, the difference between the voltage value of the compensation voltage terminal V0 at the end time of the time period and the voltage value at the beginning time of the time period is equal to the voltage value dropped by the control terminal of the driving module 11.
In other alternative embodiments, in order to reduce the difficulty of generating the voltage at the compensation voltage terminal V0, as shown in fig. 4, at least during the light emitting period t3, the voltage at the compensation voltage terminal V0 may be increased linearly.
In some alternative embodiments, as shown in fig. 5, the leakage compensation module 15 may include a first transistor M1 and a first capacitor C1.
The gate of the first transistor M1 is connected to the compensation control signal line CL, the first pole of the first transistor M1 is connected to the compensation voltage terminal V0, the second pole of the first transistor M1 is connected to the first pole of the first capacitor C1, and the second pole of the first capacitor C1 is connected to the control terminal of the driving module 11. During the light emitting period, the signal on the compensation control signal line CL can control the first transistor M1 to be turned on.
As an example, the signal on the compensation control signal line CL may control the first transistor M1 to turn off during the initialization phase and the data writing phase.
In the light emitting period, the first transistor M1 is turned on, and the voltage of the compensation voltage terminal V0 is transmitted to the first electrode of the first capacitor C1 through the first transistor M1. Taking any time period in the light emitting stage as an example, the compensation voltage terminal V0 can output a voltage of 0.05V jumping upward in the time period, the voltage of the first pole of the first capacitor C1 jumps upward by 0.05V, and due to the coupling effect of the capacitors, the voltage difference between the two poles of the first capacitor C1 does not suddenly change, so that the voltage of the second pole of the first capacitor C1 also jumps upward by 0.05V, the second pole of the first capacitor C1 is connected with the control terminal of the driving module 11, that is, the first capacitor C1 can couple the jump voltage of the compensation voltage terminal V0 to the control terminal of the driving module 11, thereby reducing or canceling the voltage dropped by the control terminal of the driving module 11.
In some alternative embodiments, the emission control signal line Emit may be multiplexed as the compensation control signal line CL. On one hand, the number of signal lines can be reduced, which is beneficial to improving the pixel density of the display panel. On the other hand, for the display panel provided with the pixel circuits of the embodiment of the present application, the pixel circuits may be arranged in multiple rows, and the pixel circuits may be scanned line by line in the same frame, and the pixel circuits in each row sequentially enter the light-emitting stage, so that the time when the pixel circuits in each row enter the light-emitting stage is different. By multiplexing the emission control signal line Emit as the compensation control signal line CL, voltage compensation can be sequentially performed on the control end of the driving module 11 according to the time of the emission phase of each row of pixel circuits, thereby realizing the divisional compensation and even the divisional compensation.
In some alternative embodiments, as shown in fig. 6, the pixel circuit 10 may further include a storage capacitor Cst, a first pole of the storage capacitor Cst is connected to the first power line PVDD, and a second pole of the storage capacitor Cst is connected to the control terminal of the driving module 11. The storage capacitor Cst can be used to store the charge written to the control terminal of the driving module 11.
In some alternative embodiments, as shown in fig. 7, the storage capacitor Cst may be reused as the first capacitor C1. The first pole of the storage capacitor Cst is connected not only to the first power line PVDD but also to the second pole of the first transistor M1.
When the first transistor M1 is turned on, the voltage of the first electrode of the storage capacitor Cst is the sum of the voltage of the compensation voltage terminal V0 and the voltage on the first power line PVDD. For example, when the first transistor M1 is turned on, the voltage on the first power line PVDD is 4.6V, and the voltage at the compensation voltage terminal V0 at a certain time is 0.1V, so that the voltage at the first pole of the storage capacitor Cst at the certain time is 4.7V (4.6V +0.1v = 4.7V).
In this embodiment, the storage capacitor Cst is multiplexed into the first capacitor C1, so that the first capacitor does not need to be additionally disposed, which is beneficial to improving the pixel density of the display panel.
In some optional embodiments, in a case where the storage capacitor Cst is multiplexed as the first capacitor C1, during the light emitting period, the voltage of the compensation voltage terminal V0 may be greater than or equal to 0, and the maximum value of the voltage of the compensation voltage terminal V0 is smaller than the voltage of the first power line PVDD.
In the light emitting stage, the voltage of the first electrode of the storage capacitor Cst is the sum of the voltage of the compensation voltage terminal V0 and the voltage of the first power line PVDD, and if the voltage of the compensation voltage terminal V0 is less than 0, the voltage of the first electrode of the storage capacitor Cst is equivalent to a downward jump, which may cause the voltage of the control terminal of the driving module 11 to jump further downward, which may not only compensate the voltage dropped from the control terminal of the driving module 11, but may also make the voltage dropped from the control terminal of the driving module 11 more. This can be avoided by setting the voltage at the compensation voltage terminal V0 to 0 or higher at least in the light emission phase.
In addition, setting the maximum value of the voltage of the compensation voltage terminal V0 to be smaller than the voltage of the first power supply line PVDD can avoid causing large power consumption.
In some alternative embodiments, as shown in fig. 8, the data writing module 12 may include a second transistor M2, the driving module 11 may include a third transistor M3, the threshold compensation module 17 may include a fourth transistor M4, the first initialization module 16 may include a fifth transistor M5, the light emitting control module 14 may include a sixth transistor M6 and a seventh transistor M7, the second initialization module 18 may include an eighth transistor M8, and the light emitting module 13 may include a light emitting diode D.
The gate of the third transistor M3 is used as the control terminal of the driving module 11, the first pole of the third transistor M3 is used as the first terminal of the driving module 11, and the second pole of the third transistor M3 is used as the second terminal of the driving module 11.
A gate of the fifth transistor M5 is connected to the first scan line S1, a first pole of the fifth transistor M5 is connected to the initialization signal line Vref, and a second pole of the fifth transistor M5 is connected to a gate of the third transistor M3.
The gate of the second transistor M2 is connected to the second scan line S2, the first pole of the second transistor M2 is connected to the data line data, and the second pole of the second transistor M2 is connected to the first pole of the third transistor M3.
The gate of the fourth transistor M4 is connected to the second scan line S2, the first pole of the fourth transistor M4 is connected to the second pole of the third transistor M3, and the second pole of the fourth transistor M4 is connected to the gate of the third transistor M3.
A gate of the sixth transistor M6 is connected to the emission control signal line Emit, a first pole of the sixth transistor M6 is connected to the first power line PVDD, and a second pole of the sixth transistor M6 is connected to the first pole of the third transistor M3.
A gate of the seventh transistor M7 is connected to the emission control signal line Emit, a first pole of the seventh transistor M7 is connected to the second pole of the third transistor M3, and a second pole of the seventh transistor M7 is connected to the first pole of the light emitting diode D.
The gate of the eighth transistor M8 is connected to the third scan line S3, the first electrode of the eighth transistor M8 is connected to the initialization signal line Vref, and the second electrode of the eighth transistor M8 is connected to the first electrode of the light emitting diode D.
The second pole of the led D is connected to the second power line PVEE.
In the pixel circuit provided by the application, each transistor can be a low-temperature polysilicon transistor, an oxide transistor, a P-type transistor, or an N-type transistor. Alternatively, some of the transistors of the pixel circuit may be P-type low temperature polysilicon transistors, and another part of the transistors may be N-type oxide transistors. For example, the fourth transistor M4 and the fifth transistor M5 may be N-type oxide transistors, and the other transistors may be P-type low temperature polysilicon transistors. The on level of the P-type transistor is low level, and the off level is high level; the on level of the N-type transistor is high, and the off level is low.
The individual transistors are illustrated as P-type transistors in the drawings herein, which are not intended to limit the present application.
Illustratively, the first pole of each transistor may be a source and the second pole may be a drain. Alternatively, the first pole of each transistor may be a drain and the second pole may be a source. The source or the drain of the transistor can be determined according to the voltage of each pole in the actual working process, which is not limited in the application.
The light emitting diode D may be an OLED. The first pole of the light emitting diode D may be an anode and the second pole of the light emitting diode D may be a cathode.
For example, the emission control signal line Emit is multiplexed as the compensation control signal line CL, and the signal of the third scanning line S3 is the same as the signal of the second scanning line S2, reference is made to fig. 2 and 8 in combination.
In the initialization stage t1, the signal of the first scan line S1 is at a low level, the signals of the second scan line S2, the third scan line S3, and the emission control signal line Emit are at a high level, the fifth transistor M5 is turned on, the voltage on the initialization signal line Vref is written into the gate of the third transistor M3, and the gate of the third transistor M3 is initialized.
In the data writing phase t2, the signals of the second scan line S2 and the third scan line S3 are at a low level, the signals of the first scan line S1 and the emission control signal line Emit are at a high level, the second transistor M2 and the fourth transistor M4 are turned on, the data voltage on the data line data is written into the gate of the third transistor M3, and the fourth transistor M4 captures the threshold voltage of the third transistor M3 and writes the threshold voltage of the third transistor M3 into the gate of the third transistor M3. In addition, in the data writing period t2, the eighth transistor M8 is turned on, and the voltage on the initialization signal line Vref is written into the first electrode of the light emitting diode D to initialize the first electrode of the light emitting diode D.
In the light emitting period t3, the signals of the first scan line S1, the second scan line S2 and the third scan line S3 are at a high level, the signal of the light emitting control signal line Emit is at a low level, the sixth transistor M6 and the seventh transistor M7 are turned on, the third transistor M3 generates a driving current and transmits the driving current to the light emitting diode D, and the light emitting diode D emits light. In addition, during the light emitting period t3, the first transistor M1 is turned on, the transition voltage of the compensation voltage terminal V0 is transmitted to the first electrode of the storage capacitor Cst, and the storage capacitor Cst couples the transition voltage of the compensation voltage terminal V0 to the gate of the third transistor M3 to compensate the voltage dropped from the gate of the third transistor M3.
Based on the same inventive concept, as shown in fig. 9, the present embodiment further provides a display panel 100 including the pixel circuit 10 according to any one of the above embodiments.
For example, the display panel 100 provided in the embodiments of the present application may support a low frequency mode and a high frequency mode. For example, the low frequency mode may include a refresh rate less than 60Hz, such as 30Hz, 15Hz, and the like. The high frequency mode may include a refresh rate greater than or equal to 60Hz, such as 60Hz, 90Hz, 120Hz, 144Hz, and the like.
It should be understood by those skilled in the art that in other implementations of the present application, the display panel may also be a Micro light emitting diode (Micro LED) display panel, a quantum dot display panel, or the like.
The display panel provided in the embodiments of the present application has the beneficial effects of the pixel circuit provided in the embodiments of the present application, and specific reference may be made to the specific description of the pixel circuit in the above embodiments, which is not repeated herein.
Referring to fig. 9, the display area AA of the display panel 100 may include a plurality of rows of pixel circuits 10. Taking the first direction X as a row direction and the second direction Y as a column direction as an example, the plurality of rows of pixel circuits 10 may be arranged in the second direction Y.
At least some of the rows of pixel circuits may each correspond to a different compensation voltage terminal. Referring to fig. 10, fig. 10 shows a timing diagram of a control terminal and a compensation voltage terminal of a driving module of pixel circuits in an ith row, an (i + 1) th row and an (i + 2) th row, where i is an integer greater than or equal to 1. Taking the i-th row, the i + 1-th row and the i + 2-th row of pixel circuits corresponding to different compensation voltage terminals V0 as an example, the voltage of the compensation voltage terminal V0 may gradually increase in the light emitting stage of the corresponding pixel circuit.
It can be understood that, when a frame of picture is displayed, pixel circuits in each row can be scanned line by line, and in fig. 10, pixel circuits in the ith row, the (i + 1) th row and the (i + 2) th row can sequentially enter their respective light-emitting stages. For example, when displaying the j frame picture, the lighting phase of the ith row of pixel circuits may be t i,j Time t i,j+1 At time, the light emitting period of the pixel circuits in the (i + 1) th row can be t i+1,j At time t i+1,j+1 At time, the lighting period of the i +2 th row of pixel circuits may be t i+2,j Time t i+2,j+1 Time of day t i,j At a time t i+1,j Before time, t i+1,j At a time t i+2,j Before time, t i,j+1 At a time t i+1,j+1 Before time, t i+1,j+1 At a time t i+2,j+1 Before the moment. The respective light-emitting periods of the pixel circuits in different rows may be equal when displaying the same frame.
In addition, fig. 10 also illustrates only the voltage waveforms of the compensation voltage terminal V0 corresponding to each row of pixel circuits in the light-emitting phase, and the voltage waveforms of the compensation voltage terminal V0 in the initialization phase and the data writing phase are not limited in the present application. For example, the voltage of the compensation voltage terminal V0 may be maintained at a preset initial value in other phases than the lighting phase.
In some alternative embodiments, as shown in fig. 9, the leakage compensation modules of at least two rows of pixel circuits 10 are connected to the same compensation voltage terminal V0. The multi-row pixel circuits share one compensation voltage end, so that the number of the compensation voltage ends can be reduced, and the display panel has a narrower frame.
In addition, under the condition that the pixel circuits in multiple rows share one compensation voltage end, when the pixel circuits in the last row enter the light-emitting stage, the voltage of the compensation voltage end is gradually increased, even if the voltage of the compensation voltage end shared before the light-emitting stage of the pixel circuits in the next row is gradually increased, the electric leakage compensation module can be only switched on in the light-emitting stage corresponding to the pixel circuits, so that the electric leakage compensation module can be in a switched-off state before the light-emitting stage of the electric leakage compensation module, and the initialization stage or the data writing stage of the pixel circuits in the next row cannot be influenced.
Under the condition that a plurality of rows of pixel circuits share one compensation voltage end, assuming that the voltage of the compensation voltage end is gradually increased, the compensation voltage end starts to compensate the last row of pixel circuits in the plurality of rows of pixel circuits, and the compensation voltage end compensates according to the voltage leaked from the driving module control end of the last row of pixel circuits. When the compensation is started for the next row of pixel circuits, the voltage at the compensation voltage end has increased to a certain value, and at this time, the compensation voltage at the compensation voltage end and the voltage leaked by the driving module control end of the next row of pixel circuits are not necessarily equal, for example, the compensation voltage at the compensation voltage end is greater than the voltage leaked by the driving module control end of the next row of pixel circuits. Because the difference between the rows is negligible in the subdivided region, even if the compensation voltage at the compensation voltage end is greater than the voltage dropped from the control end of the driving module of the pixel circuit in the next row, the difference of the brightness is not brought.
As an example, the display area AA of the display panel 100 may include a plurality of sub-display areas, the pixel circuits of the same sub-display area are connected to the same compensation voltage terminal, and the pixel circuits of different sub-display areas are connected to different compensation voltage terminals.
The number of rows of pixel circuits included in each sub-display section may be equal.
It can be understood that the larger the number of the sub-display regions, the better the corresponding compensation effect. The number of sub-display sections may be set to be maximized according to the actual situation.
The compensation voltage terminal V0 may be disposed in the non-display area NA of the display panel. The specific position of the compensation voltage terminal V0 in the non-display area NA may be set according to practical situations, which is not limited in this application.
As one example, the display panel may further include a light emission control circuit (not shown in the figure), the light emission control circuit may include a plurality of cascaded shift register units, and a light emission control signal output from the shift register units may be transmitted to the pixel circuits through a light emission control signal line. One shift register unit may drive one row of pixel circuits, or one shift register unit may drive a plurality of rows of pixel circuits, for example, one shift register unit may drive two, three, four, etc. rows of pixel circuits.
In the case where one shift register unit drives N rows of pixel circuits, N is an integer equal to or greater than 2, and the number of rows of pixel circuits included in the sub-display region may be an integer multiple of N.
Based on the same inventive concept, the application also provides a display device which comprises the display panel provided by the application. Referring to fig. 11, fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. Fig. 11 provides a display device 1000 including the display panel 100 according to any of the above embodiments of the present application. The display device 1000 is described in the embodiment of fig. 11 by taking a mobile phone as an example, but it should be understood that the display device provided in the embodiment of the present application may be other display devices having a display function, such as a wearable product, a computer, a television, and a vehicle-mounted display device, and the present application is not limited thereto. The display device provided in the embodiment of the present application has the beneficial effects of the display panel provided in the embodiment of the present application, and specific reference may be specifically made to the specific description of the display panel in each of the above embodiments, which is not repeated herein.
In accordance with the embodiments of the present application as described above, these embodiments are not exhaustive and do not limit the application to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated. The application is limited only by the claims and their full scope and equivalents.
Claims (13)
1. A pixel circuit is characterized by comprising a driving module, a data writing module, a light-emitting control module and a leakage compensation module;
the data writing module is used for writing a data signal into the control end of the driving module in a data writing stage;
the light-emitting control module, the driving module and the light-emitting module are connected between a first power line and a second power line, and the light-emitting control module is used for controlling the light-emitting module to emit light according to the driving current output by the driving module according to the signal on the light-emitting control signal line;
and the leakage compensation module is connected between a compensation voltage end and the control end of the driving module and is used for coupling the jump voltage of the compensation voltage end to the control end of the driving module in a light-emitting stage so as to compensate the voltage leaked from the control end of the driving module.
2. The pixel circuit according to claim 1, wherein the voltage of the compensation voltage terminal is gradually increased at least in the light emitting period.
3. The pixel circuit according to claim 2, wherein the waveform of the voltage signal at the compensation voltage terminal is arc-shaped at least during the light-emitting period.
4. The pixel circuit according to claim 2, wherein the voltage at the compensation voltage terminal increases linearly at least during the light emitting period.
5. The pixel circuit according to any one of claims 1 to 4, wherein the leakage compensation module comprises a first transistor and a first capacitor;
the grid electrode of the first transistor is connected with a compensation control signal line, the first pole of the first transistor is connected with the compensation voltage end, the second pole of the first transistor is connected with the first pole of the first capacitor, and the second pole of the first capacitor is connected with the control end of the driving module;
and in the light-emitting stage, the first transistor is controlled to be conducted by a signal on the compensation control signal line.
6. The pixel circuit according to claim 5, further comprising a storage capacitor, wherein a first pole of the storage capacitor is connected to the first power line, and a second pole of the storage capacitor is connected to the control terminal of the driving module.
7. The pixel circuit according to claim 6, wherein the storage capacitor is multiplexed into the first capacitor.
8. The pixel circuit according to claim 7, wherein a voltage of the compensation voltage terminal is equal to or greater than 0 during the light-emitting period, and a maximum value of the voltage of the compensation voltage terminal is smaller than a voltage of the first power supply line.
9. The pixel circuit according to claim 5, wherein the light emission control signal line is multiplexed as the compensation control signal line.
10. The pixel circuit according to claim 5, further comprising a first initialization module, a threshold compensation module, and a second initialization module, wherein the data writing module comprises a second transistor, the driving module comprises a third transistor, the threshold compensation module comprises a fourth transistor, the first initialization module comprises a fifth transistor, the light emission control module comprises a sixth transistor and a seventh transistor, the second initialization module comprises an eighth transistor, and the light emission module comprises a light emitting diode;
the grid electrode of the third transistor is used as a control end of the driving module;
a gate of the fifth transistor is connected to a first scan line, a first pole of the fifth transistor is connected to an initialization signal line, and a second pole of the fifth transistor is connected to a gate of the third transistor;
the grid electrode of the second transistor is connected with a second scanning line, the first pole of the second transistor is connected with a data line, and the second pole of the second transistor is connected with the first pole of the third transistor;
a gate of the fourth transistor is connected to a second scan line, a first pole of the fourth transistor is connected to a second pole of the third transistor, and a second pole of the fourth transistor is connected to a gate of the third transistor;
a gate of the sixth transistor is connected to the emission control signal line, a first electrode of the sixth transistor is connected to the first power supply line, and a second electrode of the sixth transistor is connected to a first electrode of the third transistor;
a gate of the seventh transistor is connected to the light emission control signal line, a first electrode of the seventh transistor is connected to a second electrode of the third transistor, and a second electrode of the seventh transistor is connected to a first electrode of the light emitting diode;
a gate of the eighth transistor is connected to a third scan line, a first electrode of the eighth transistor is connected to the initialization signal line, and a second electrode of the eighth transistor is connected to the first electrode of the light emitting diode;
and the second pole of the light-emitting diode is connected with the second power line.
11. A display panel comprising the pixel circuit according to any one of claims 1 to 10.
12. The display panel according to claim 11, wherein the display panel comprises a plurality of rows of the pixel circuits;
the electric leakage compensation modules of at least two rows of the pixel circuits are connected to the same compensation voltage end.
13. A display device characterized by comprising the display panel according to any one of claims 11 to 12.
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