CN114913815A - Pixel driving circuit, initialization method, display panel and display device - Google Patents
Pixel driving circuit, initialization method, display panel and display device Download PDFInfo
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- CN114913815A CN114913815A CN202210479743.6A CN202210479743A CN114913815A CN 114913815 A CN114913815 A CN 114913815A CN 202210479743 A CN202210479743 A CN 202210479743A CN 114913815 A CN114913815 A CN 114913815A
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The application discloses pixel drive circuit, initialization method, display panel and display device, wherein, pixel drive circuit includes: the driving module is used for providing driving current for the light-emitting unit; the control end of the light-emitting control module is connected with a light-emitting control signal line and used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal emitted by the light-emitting control signal line; the initialization module is used for accessing the light-emitting control signal in a non-light-emitting stage of the light-emitting unit so as to initialize the light-emitting unit and the driving module, and the light-emitting control signals in the non-light-emitting stage and the light-emitting stage are different. This application can reduce display panel internal wiring to improve display panel's flexible bending degree and resolution ratio.
Description
Technical Field
The present application belongs to the field of display technologies, and in particular, to a pixel driving circuit, an initialization method, a display panel, and a display device.
Background
With the development of display technology, a new generation of OLED (Organic Light-Emitting Diode) display panel is becoming the mainstream. However, the OLED display panel has many internal circuits, which results in poor flexibility and poor resolution.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit, an initialization method, a display panel and a display device, which can reduce internal wiring of the display panel, so that the flexible bending degree and the resolution of the display panel are improved.
In a first aspect, a pixel driving circuit is provided, which includes:
the driving module is used for providing driving current for the light-emitting unit;
the control end of the light-emitting control module is connected with the light-emitting control signal line and used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal emitted by the light-emitting control signal line;
the initialization module is used for accessing a light-emitting control signal in a non-light-emitting stage of the light-emitting unit so as to initialize the light-emitting unit and the driving module, wherein the light-emitting control signals in the non-light-emitting stage are different from those in the light-emitting stage.
Optionally, the control end of the initialization module is connected to the first scanning signal line, the input end of the initialization module is connected to the light-emitting control signal line, and the output end of the initialization module is connected to the control end of the driving module and the light-emitting unit;
and the initialization module is also used for cutting off according to the low-level signal sent by the first scanning signal line in the light-emitting stage.
Optionally, the initialization module includes a first initialization transistor and a second initialization transistor, and both the first initialization transistor and the second initialization transistor are NMOS transistors;
the control electrode of the first initialization transistor is connected with the first scanning signal line, the first electrode of the first initialization transistor is connected with the light-emitting control signal line, and the second electrode of the first initialization transistor is connected with the control end of the driving module;
the control electrode of the second initialization transistor is connected with the first scanning signal line, the first electrode of the second initialization transistor is connected with the light-emitting control signal line, and the second electrode of the second initialization transistor is connected with the light-emitting unit.
Optionally, the non-light emitting stage includes an initialization stage and a compensation stage which are sequentially set;
the initialization module is specifically used for conducting according to a high level signal sent by a first scanning signal line in an initialization stage so as to access a light-emitting control signal and initialize the light-emitting unit and the driving module;
the initialization module is further specifically configured to cut off the low level signal sent by the first scanning signal line in the compensation phase.
Optionally, the pixel driving circuit further comprises:
and the compensation module is used for compensating the threshold voltage of the control end of the driving module in a compensation stage.
Optionally, the lighting control module comprises:
the light-emitting control transistor is used for allowing the light-emitting unit to enter a light-emitting stage when receiving a high-level signal sent by the light-emitting control signal line; and when receiving a low level signal sent by the light-emitting control signal line, controlling the light-emitting unit to enter a non-light-emitting stage.
Optionally, the light-emitting control transistor includes a first light-emitting control transistor and a second light-emitting control transistor, and both the first light-emitting control transistor and the second light-emitting control transistor are NMOS transistors;
the control electrode of the first light-emitting control transistor is connected with the light-emitting control signal line, the first electrode of the first light-emitting control transistor is connected with the positive power signal, and the second electrode of the first light-emitting control transistor is connected with the first end of the driving module;
the control electrode of the second light-emitting control transistor is connected with the light-emitting control signal line, the first electrode of the second light-emitting control transistor is connected with the second end of the driving module, and the second electrode of the second light-emitting control transistor is connected with the light-emitting unit.
In a second aspect, there is provided an initialization method applied to the pixel driving circuit of the above aspect, the method including:
and in the non-light-emitting stage of the light-emitting unit, the initialization module is connected to the light-emitting control signal sent by the light-emitting control signal line so as to initialize the light-emitting unit and the driving module.
In a third aspect, there is provided a display panel including a light emitting unit and a pixel driving circuit connected to the light emitting unit, the pixel driving circuit being configured as the pixel driving circuit of the above aspect.
In a fourth aspect, there is provided a display device including the display panel of the above aspect.
Compared with the prior art, the pixel driving circuit, the initialization method, the display panel and the display device provided by the embodiment of the application have the advantages that the driving module, the light-emitting control module and the initialization module are arranged, wherein the driving module can provide driving current for the light-emitting unit; the control end of the light-emitting control module is connected with the light-emitting control signal line, so that the light-emitting control module can selectively allow the light-emitting unit to enter a light-emitting stage according to the light-emitting control signal sent by the light-emitting control signal line; the light-emitting control signal line connected with the light-emitting control module is also used for being connected to the initialization module in the non-light-emitting stage of the light-emitting unit. Therefore, the initialization module can initialize the light-emitting unit and the driving module through the light-emitting control signal, so that the light-emitting control signal wire replaces a reference voltage signal wire in the related technology, the internal wiring of the display panel is saved, the improvement of the resolution and the panel flexibility of the display panel is facilitated, and the resolution and the flexible bending degree of the display panel are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit configuration diagram of a pixel driving circuit of the related art.
Fig. 2 is a schematic diagram of an alternative circuit structure of a pixel driving circuit according to an embodiment of the present application.
Fig. 3 is a schematic diagram of another alternative circuit structure of a pixel driving circuit according to an embodiment of the present application.
Fig. 4 is a signal timing diagram of a pixel driving circuit according to an embodiment of the present application.
Fig. 5 is a schematic diagram of another alternative circuit structure of a pixel driving circuit according to an embodiment of the present application.
Fig. 6 is a schematic diagram of yet another alternative circuit structure of a pixel driving circuit according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present application.
In the drawings:
a positive power signal PVDD, a first scanning signal line S1, a second scanning signal line S2, a light emission control signal line EM, a data signal line Vdata, a pixel driving circuit 1, a light emitting unit 2, a driving module 11, a light emission control module 12, an initialization module 13, a compensation module 14, a data writing module 15, a memory module C1, an initialization stage T1, a compensation stage T2, a light emission stage T3, a driving transistor T0, a first initialization transistor T1, a second initialization transistor T2, a first light emission control transistor T3, a second light emission control transistor T4, a compensation transistor T5, and a data writing transistor T6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and 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 is to be understood that the terms "upper", "lower", "left", "right", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience of description only, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of this patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise. Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In order to explain the technical solution of the present application, the following detailed description is made with reference to the specific drawings and examples.
As described in the background art, with the development of display technology, a new generation of OLED (Organic Light-Emitting Diode) display panel is becoming mainstream. In recent years, curved-screen and high-definition display terminals based on OLED display panels are promoted, so that one of the main development directions of OLED display panels is flexible OLEDs with high definition.
While the OLED display panel has high definition display without driving an internal pixel driving circuit, referring to fig. 1, fig. 1 shows a pixel driving circuit in the related art, which is connected to a light emitting unit. It is usually in a 7T1C structure, that is, the pixel driving circuit is composed of 7 TFTs (Thin Film transistors) and a capacitor, wherein the TFTs are PMOS transistors.
In addition, in order to enable the display panel to normally switch the image frames and ensure the normal display of each frame, the pixel driving circuit also needs to receive various control signals.
The control signal may include a data signal, a scan signal, a light emitting control signal, a reference voltage signal, and the like. These control signals are connected to the TFTs through control signal lines to achieve signal transmission, so that the display panel has many internal circuits after being manufactured.
However, the current situation of the various internal circuits is not favorable for the high resolution of the display panel, and the flexible bending degree and resolution are reduced, so the pixel driving circuit in the related art is not in line with the development direction of the OLED.
In addition, the Display panel has enough power sources inside itself, and the arrangement of the reference voltage lines in the control signal lines makes it necessary to arrange one more power source in a Display Driver IC (DDIC) of the Display panel, which increases the power consumption of the Display Driver IC and increases the manufacturing cost.
In order to solve the above technical problem, the present application provides a pixel driving circuit, an initialization method, a display panel and a display device.
Referring to fig. 2, fig. 2 is a schematic diagram of an alternative circuit structure of an example of the pixel driving circuit 1 according to the embodiment of the present application. In this example, the pixel drive circuit 1 described above may include:
a driving module 11, the driving module 11 being operable to provide a driving current for the light emitting unit 2.
And a control end of the light-emitting control module 12 is connected with the light-emitting control signal line EM. The lighting control module 12 may be configured to selectively allow the lighting unit 2 to enter a lighting phase according to a lighting control signal sent from the lighting control signal line EM.
An initialization module 13, where the initialization module 13 may be configured to access a light emitting control signal during a non-light emitting period of the light emitting unit 2 to initialize the light emitting unit 2 and the driving module 11, and the light emitting control signal during the non-light emitting period is different from the light emitting control signal during the light emitting period.
It should be noted that the pixel driving circuit 1 may be connected to a Light Emitting unit 2, and the Light Emitting unit 2 may be an LED (Light-Emitting Diode), an OLED (Organic Light Emitting semiconductor), or the like.
Exemplarily, when the light emitting unit 2 is an OLED, the pixel driving circuit 1 described above may be applied to an OLED display panel, particularly, a flexible OLED display panel.
With reference to fig. 2, the process of driving the light emitting unit 2 to display by the pixel driving circuit 1 may at least include an initialization phase, a data writing phase, a compensation phase, and a light emitting phase. In which a distinction is made as to whether the light emitting unit 2 is in a light emitting state, the other stages than the light emitting stage may be referred to as non-light emitting stages. In the non-light emitting stage, the light emitting unit 2 may not emit light.
In the light emitting stage, the light emitting control signal line EM may output an active signal to control the light emitting control module 12 to be turned on, so as to allow the light emitting unit 2 to enter the light emitting stage. In the non-emission period, the emission control signal line EM may keep the emission control module 12 turned off.
In this case, the light emission control signal line EM may be connected to the initialization block 13 by replacing the reference voltage signal line in the related art with the light emission control signal line EM, which is generated by the light emission control signal line EM in the non-light emission stage. The initialization module 13 may access the light emitting control signal during the non-light emitting stage of the light emitting unit 2, and further initialize the light emitting unit 2 and the driving module 11 by using the light emitting control signal line EM. Through this kind of improvement setting, can realize the multiplexing of luminous control signal line EM, need not set up special reference voltage signal line in pixel drive design, reduced the internal circuit, be favorable to improving resolution and panel flexibility, also avoid showing that driver IC increases the power again, practiced thrift manufacturing cost, compare the correlation technique and reduced the product consumption.
That is, in the pixel driving circuit 1 of the embodiment of the present application, by providing the driving module 11, the light-emitting control module 12 and the initialization module 13, the driving module 11 can provide a driving current for the light-emitting unit 2; the control end of the light-emitting control module 12 is connected to the light-emitting control signal line EM, so that the light-emitting control module 12 can selectively allow the light-emitting unit 2 to enter a light-emitting stage according to the light-emitting control signal sent by the light-emitting control signal line EM; the light-emitting control signal line EM connected to the light-emitting control module 12 is also used for accessing the initialization module 13 during the non-light-emitting stage of the light-emitting unit 2. Therefore, the initialization module 13 can initialize the light-emitting unit 2 and the driving module 11 through the light-emitting control signal, so that the light-emitting control signal line EM replaces a reference voltage signal line in the related art, the internal wiring of the display panel is saved, the improvement of the resolution and the panel flexibility of the display panel is facilitated, and the resolution and the flexible bending degree of the display panel are improved.
Referring to fig. 3 and 4, fig. 3 is a schematic diagram showing an alternative circuit configuration of the pixel driving circuit 1 of the present application, and fig. 4 is a signal timing diagram showing a light emission control signal sent from the light emission control signal line EM and a control signal sent from the first scanning signal line S1 in the pixel driving circuit 1 of fig. 3. In other alternative embodiments of the pixel driving circuit 1 of the present invention, the control terminal of the initialization block 13 in the pixel driving circuit 1 may be connected to the first scan signal line S1, the input terminal of the initialization block 13 may be connected to the light-emitting control signal line EM, and the output terminal of the initialization block 13 may be connected to the control terminal of the driving block 11 and the light-emitting unit 2.
Illustratively, the output terminal of the initialization module 13 may be connected to the anode of the light emitting unit 2.
The initialization block 13 may be further configured to be turned off according to a low level signal from the first scanning signal line S1 during the light emitting period T3.
It should be noted that, in the present embodiment, an alternative connection structure of the initialization module 13 is provided, in which the different-level signal sent by the first scanning signal line S1 controls whether the initialization module 13 performs the initialization function.
The high-level signal sent by the first scanning signal line S1 can be considered as an active signal for the control terminal of the initialization module 13. When the first scan signal line S1 sends out a low level signal, the initialization block 13 is turned off, and no matter what state of the light emitting control signal is sent out by the light emitting control signal line EM connected to the input terminal of the initialization block 13, it cannot be fed back to the initialization block 13 and the driving block 11. In the embodiment, it is limited that the first scan signal can be in the light-emitting period T3 when the first scan signal sends out the low level signal, so that the initialization module 13 in this period can be ensured not to interfere with the rest of the pixel driving circuit 1, and accurate control is facilitated.
With continued reference to fig. 3 and 4, in further alternative embodiments of the pixel driving circuit 1 of the present invention, the non-emitting period may include an initialization period T1 and a compensation period T2, which are sequentially arranged.
The initialization module 13 may be specifically configured to turn on according to a high level signal sent by the first scanning signal line S1 during the initialization period T1 to access the light emitting control signal to initialize the light emitting unit 2 and the driving module 11.
The initialization block 13 may also be turned off during the compensation period T2 according to the low level signal from the first scan signal line S1.
It should be noted that, at the control end of the initialization block 13, the high-level signal sent by the first scanning signal line S1 may be considered as an active signal. When the initialization stage T1 is in the non-emission stage, the initialization block 13 is turned on after being controlled, and the initialization block 13 is enabled to provide the emission control signal from the emission control signal line EM to the driving block 11 and the light-emitting unit 2 as the initialization signal, so that the driving block 11 is initialized before being used, and the light-emitting unit 2 is initialized before emitting light, thereby replacing the reference voltage signal line in the related art and saving the internal wiring of the display panel.
In addition, the present embodiment also defines that the first scan signal can be in the compensation phase T2 when it sends out a low level signal, so as to ensure that the initialization module 13 in this phase does not interfere with the rest of the pixel driving circuit 1, and help to realize accurate control.
In still other alternative examples, with continued reference to fig. 3 and 4, the pixel driving circuit 1 may further include:
the compensation module 14 may be configured to compensate the threshold voltage of the control terminal of the driving module 11 during the compensation period T2.
In the display panel, a thin film transistor is generally used as a switching element, but a threshold voltage shift is easily caused due to a characteristic difference, and when the thin film transistor is provided in the driving module 11, the display unevenness of the display panel is easily caused by the threshold voltage shift phenomenon, and therefore, it is necessary to improve the display unevenness by circuit compensation.
In this embodiment, the compensation module 14 is provided, and the compensation module 14 can compensate the threshold voltage of the control end of the driving module 11, so that the driving module 11 can be normally turned on and off, the phenomenon of threshold voltage drift is prevented, and the phenomenon of display unevenness of the display panel is improved.
With continued reference to fig. 3 and 4, in still other alternative examples of the pixel driving circuit 1 of the present application, the initialization module 13 may include a first initialization transistor T1 and a second initialization transistor T2, and each of the first initialization transistor T1 and the second initialization transistor T2 may be an NMOS transistor.
A control electrode of the first initializing transistor T1 may be connected to the first scan signal line S1, a first electrode of the first initializing transistor T1 may be connected to the emission control signal line EM, and a second electrode of the first initializing transistor T1 may be connected to a control terminal of the driving module 11.
A control electrode of the second initializing transistor T2 may be connected to the first scanning signal line S1, a first electrode of the second initializing transistor T2 is connected to the emission control signal line EM, and a second electrode of the second initializing transistor T2 may be connected to the light emitting unit 2.
I.e. in this embodiment two NMOS type initialization transistors are provided for the driving module 11 and the light emitting unit 2, the control electrodes of which may be the gates of the initialization transistors. In the initialization stage T1, the first scan signal line S1 is at a high level, the first initialization transistor T1 and the second initialization transistor T2 are turned on, and the emission control signal from the emission control signal line EM is at a low level, so as to pull down the control terminal of the driving module 11 and the anode potential of the light emitting unit 2, thereby initializing the driving module 11 and the light emitting unit 2.
It should be noted that the power consumption of the light emitting control signal is usually large when controlling light emission, and the current required for initializing the control terminal of the driving module 11 and the anode of the light emitting unit 2 is small, so that the light emitting control signal in the non-light emitting stage can completely meet the current requirement for initialization. Therefore, the multiplexing method of the light-emitting control signal line EM is provided, the internal wiring of the display panel is saved, the resolution and the panel flexibility are improved, and the resolution and the flexible bending degree of the display panel are improved.
Referring to fig. 5 and fig. 4 together, wherein fig. 5 is a schematic diagram of another alternative circuit structure of the pixel driving circuit 1 according to the embodiment of the present application, and the signal timing of each signal in fig. 4 is also applicable. In this alternative example, the above-described light emission control module 12 may include a light emission control transistor. The light emission control transistor may be configured to allow the light emitting unit 2 to enter the light emission period T3 upon receiving a high level signal from the light emission control signal line EM. The emission control transistor may also control the emission unit 2 to enter a non-emission stage upon receiving a low level signal from the emission control signal line EM.
In the present embodiment, the light emission control transistor included in the light emission control module 12 is also active high, similarly to the initialization transistor described above. When the light emitting unit 2 is in the non-light emitting stage, the light emitting control signal line EM may output a light emitting control signal in a low level state, and the light emitting control signal in the low level state may be multiplexed as an initialization signal to help initialize the driving module 11 and the light emitting unit 2. When the light-emitting unit 2 is in the light-emitting period T3, the light-emitting control signal line EM outputs the light-emitting control signal in the high state, and the light-emitting control transistor is turned on, thereby allowing the light-emitting unit 2 to enter the light-emitting period T3.
The present embodiment provides a timing control scheme for the light-emitting control module 12, which realizes multiplexing of the light-emitting control signal line EM at different stages, and indirectly saves internal wiring of the display panel.
In other embodiments, with continued reference to fig. 5, the light-emitting control transistors may include a first light-emitting control transistor T3 and a second light-emitting control transistor T4, and both the first light-emitting control transistor T3 and the second light-emitting control transistor T4 may be NMOS transistors.
A control electrode of the first light-emitting control transistor T3 may be connected to the light-emitting control signal line EM, a first electrode of the first light-emitting control transistor T3 may be connected to the positive power signal PVDD, and a second electrode of the first light-emitting control transistor T3 may be connected to the first terminal of the driving module 11.
A control electrode of the second light emission controlling transistor T4 may be connected to the light emission controlling signal line EM, a first electrode of the second light emission controlling transistor T4 may be connected to the second terminal of the driving module 11, and a second electrode of the second light emission controlling transistor T4 may be connected to the light emitting cell 2.
Note that, similarly to the arrangement of the initialization transistor described above, the light emission control transistor is also defined as an NMOS type transistor in this embodiment, compared with the related art.
As can be seen from the above arrangement of the light emission control module 12, in the initialization period T1 between the light emission period T3 and the non-light emission period, the light emission control signal and the control signal transmitted from the first scan signal line S1 are opposite signals, so that the first initialization transistor T1 and the second initialization transistor T2 are turned on in the initialization period T1, and the first light emission control transistor T3 and the second light emission control transistor T4 are turned off.
In the light emitting period T3, the first and second initializing transistors T1 and T2 are turned off, and the first and second light emission controlling transistors T3 and T4 are turned on. This enables an exact selective switching on of the transistors with different functions at different stages.
This embodiment gives an optional structure of the emission control module 12, and provides a technical basis for multiplexing of the emission control signal lines EM in the pixel driving circuit 1.
In order to better explain the implementation principle of the pixel driving circuit 1 according to the embodiment of the present application, the initialization phase T1, the compensation phase T2, and the light emitting phase T3 involved in the above process are described in detail below with reference to fig. 4 and 6.
First, it should be noted that the pixel driving circuit 1 may further include a data writing module 15 and a storage module C1. The data writing module 15 may be configured to selectively provide the driving module 11 with data signals. The memory module C1 may be used to maintain the control terminal of the driving module 11 at the voltage level during the light-emitting period T3.
The driving module 11 may include a driving transistor T0, and the memory module C1 may be a capacitor, a first terminal of which may be connected to the positive power signal PVDD and a second terminal of which may be connected to a control terminal of the driving module 11 (i.e., a gate of the driving transistor T0). The data writing module 15 may include a data writing transistor T6, a control electrode of the data writing transistor T6 may be connected to the second scan signal line S2, a first electrode of the data writing transistor T6 may be connected to the data signal line Vdata, and a second electrode of the data writing transistor T6 may be connected to the first terminal of the driving module 11.
The compensation module 14 may include a compensation transistor T5, a control electrode of the compensation transistor T5 may be connected to the second scan signal line S2, a first electrode of the compensation transistor T5 may be connected to the second terminal of the driving module 11, and a second electrode of the compensation transistor T5 may be connected to the control terminal of the driving module 11. The data writing transistor T6, the driving transistor T0, and the compensating transistor T5 may all be PMOS transistors.
In the initialization period T1, only the emission control signal is at a low level, and both the first scan signal (i.e., the control signal transmitted from the first scan signal line S1) and the second scan signal (i.e., the control signal transmitted from the second scan signal line S2) are at a high level. At this time, the first and second light emission controlling transistors T3 and T4 are turned off, the first and second initializing transistors T1 and T2 are turned on, and the gate of the driving transistor T0 and the anode of the light emitting unit 2 (e.g., OLED) are initialized by the light emission control signal of low level instead of the reference voltage signal line in the related art.
In the compensation stage T2, the light emission control signal, the first scan signal and the second scan signal are all at a low level, and at this time, the first light emission control transistor T3 and the second light emission control transistor T4 are kept off, the first initialization transistor T1 and the second initialization transistor T2 are turned off, the data write transistor T6 and the compensation transistor T5 are turned on, and the compensation transistor T5 compensates for the threshold voltage of the driving transistor T0, whereby the writing of the threshold voltage to the gate of the driving transistor T0 can be achieved.
In the light emission period T3, the light emission control signal and the second scan signal are at high level, and the first scan signal is at low level. At this time, the first and second light emission controlling transistors T3 and T4 are turned on, the driving transistor T0 is turned on, the first initializing transistor T1, the second initializing transistor T2 and the compensating transistor T5 are turned off, and thus the light emitting unit 2 emits light.
The above-mentioned embodiment explains the pixel driving circuit of the present application, and the initialization method of the present application is proposed based on the pixel driving circuit of the above-mentioned embodiment, and the initialization method may include:
and in the non-light-emitting stage of the light-emitting unit, the initialization module is connected to the light-emitting control signal sent by the light-emitting control signal line so as to initialize the light-emitting unit and the driving module.
The embodiment of the application replaces a reference voltage signal wire in the related art with the light-emitting control signal wire, saves internal wiring of the display panel, and is beneficial to improving the resolution ratio and the panel flexibility of the display panel, thereby improving the resolution ratio and the flexible bending degree of the display panel.
On the basis of the embodiment of the pixel driving circuit, the embodiment of the application also protects a display panel and a display device.
Referring to fig. 7, fig. 7 is a schematic diagram of a display device provided by the present application, where the display device may include a display panel, and the display device may be at least one of a wearable device, a camera, a mobile phone, a tablet computer, a display screen, a television, and a vehicle-mounted display terminal.
The display panel comprises the pixel driving circuit and the light emitting unit, and the display device comprises the display panel, so that the display device and the display panel have all the advantages of the display panel.
In addition, the term "and/or" herein is merely an associative relationship that describes the association of objects, meaning that three relationships may exist, e.g., a and/or B,
can represent that: 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.
It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A pixel driving circuit, comprising:
the driving module is used for providing driving current for the light-emitting unit;
the control end of the light-emitting control module is connected with a light-emitting control signal line and used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal emitted by the light-emitting control signal line;
the initialization module is used for accessing the light-emitting control signal in a non-light-emitting stage of the light-emitting unit so as to initialize the light-emitting unit and the driving module, and the light-emitting control signals in the non-light-emitting stage and the light-emitting stage are different.
2. The pixel driving circuit according to claim 1, wherein the control terminal of the initialization module is connected to a first scan signal line, the input terminal of the initialization module is connected to the light emission control signal line, and the output terminal of the initialization module is connected to the control terminal of the driving module and the light emitting unit;
the initialization module is further configured to cut off according to the low level signal sent by the first scanning signal line in the light emitting stage.
3. The pixel driving circuit according to claim 2, wherein the initialization module comprises a first initialization transistor and a second initialization transistor, and both the first initialization transistor and the second initialization transistor are NMOS transistors;
a control electrode of the first initialization transistor is connected with the first scanning signal line, a first electrode of the first initialization transistor is connected with the light-emitting control signal line, and a second electrode of the first initialization transistor is connected with a control end of the driving module;
a control electrode of the second initialization transistor is connected to the first scanning signal line, a first electrode of the second initialization transistor is connected to the light emission control signal line, and a second electrode of the second initialization transistor is connected to the light emitting unit.
4. The pixel driving circuit according to claim 2, wherein the non-emission phase includes an initialization phase and a compensation phase which are sequentially set;
the initialization module is specifically configured to be turned on according to a high level signal sent by the first scanning signal line in the initialization stage to access the light emitting control signal, so as to initialize the light emitting unit and the driving module;
the initialization module is further specifically configured to cut off the low level signal sent by the first scanning signal line in the compensation stage.
5. The pixel driving circuit according to claim 4, further comprising:
and the compensation module is used for compensating the threshold voltage of the control end of the driving module in the compensation stage.
6. The pixel driving circuit according to any one of claims 1 to 5, wherein the light emission control module comprises:
the light-emitting control transistor is used for allowing the light-emitting unit to enter a light-emitting stage when receiving a high-level signal sent by the light-emitting control signal line; and when receiving a low level signal sent by the light-emitting control signal line, controlling the light-emitting unit to enter a non-light-emitting stage.
7. The pixel driving circuit according to claim 6, wherein the light emission control transistor comprises a first light emission control transistor and a second light emission control transistor, and both the first light emission control transistor and the second light emission control transistor are NMOS transistors;
a control electrode of the first light-emitting control transistor is connected with the light-emitting control signal line, a first electrode of the first light-emitting control transistor is connected with a positive power signal, and a second electrode of the first light-emitting control transistor is connected with a first end of the driving module;
and the control electrode of the second light-emitting control transistor is connected with the light-emitting control signal line, the first electrode of the second light-emitting control transistor is connected with the second end of the driving module, and the second electrode of the second light-emitting control transistor is connected with the light-emitting unit.
8. An initialization method applied to the pixel drive circuit according to any one of claims 1 to 7, the method comprising:
and in the non-light-emitting stage of the light-emitting unit, the initialization module is connected to a light-emitting control signal sent by a light-emitting control signal line so as to initialize the light-emitting unit and the driving module.
9. A display panel characterized by comprising a light emitting unit and a pixel drive circuit connected to the light emitting unit, the pixel drive circuit being configured as the pixel drive circuit according to any one of claims 1 to 7.
10. A display device characterized in that the display device comprises the display panel according to claim 9.
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| CN114913815B (en) | 2023-09-15 |
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