CN114913815B - Pixel driving circuit, initializing method, display panel and display device - Google Patents
Pixel driving circuit, initializing method, display panel and display device Download PDFInfo
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- CN114913815B CN114913815B CN202210479743.6A CN202210479743A CN114913815B CN 114913815 B CN114913815 B CN 114913815B CN 202210479743 A CN202210479743 A CN 202210479743A CN 114913815 B CN114913815 B CN 114913815B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The application discloses a pixel driving circuit, an initializing method, a display panel and a display device, wherein the pixel driving circuit comprises: 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 is used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal sent by the light-emitting control signal line; and 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, wherein the light-emitting control signal in the non-light-emitting stage is different from the light-emitting control signal in the light-emitting stage. The application can reduce the internal wiring of the display panel, thereby improving the flexibility bending degree and resolution of the display panel.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a pixel driving circuit, an initializing 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 mainstream. However, the OLED display panel has a lot of internal circuits, which results in poor flexibility and bending degree of the panel and affected resolution.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit, an initializing method, a display panel and a display device, which can reduce internal wiring of the display panel, thereby improving the flexibility bending degree and resolution of the display panel.
In a first aspect, there is provided a pixel driving circuit including:
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 is used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal sent by the light-emitting control signal line;
and the initialization module is used for accessing the light-emitting control signals 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 and the light-emitting stage are different.
Optionally, the control end of the initialization module is connected with the first scanning signal line, the input end of the initialization module is connected with the light-emitting control signal line, and the output end of the initialization module is connected with the control end of the driving module and the light-emitting unit;
the initialization module is also used for cutting off the low-level signal sent out according to the first scanning signal line in the light-emitting stage.
Optionally, the initialization module includes a first initialization transistor and a second initialization transistor, where 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 that are sequentially arranged;
the initialization module is specifically used for conducting according to a high-level signal sent by the first scanning signal line in an initialization stage so as to be connected with a light-emitting control signal and initializing the light-emitting unit and the driving module;
the initialization module is also specifically configured to cut off, in the compensation stage, the low-level signal sent by the first scanning signal line.
Optionally, the pixel driving circuit further includes:
the compensation module is used for compensating the threshold voltage of the control end of the driving module in the compensation stage.
Optionally, the light-emitting control module includes:
a light emission control transistor for allowing the light emitting unit to enter a light emission stage when receiving a high level signal emitted from the light emission control signal line; when receiving the low level signal sent by the light-emitting control signal line, the light-emitting unit is controlled 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 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 supply 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 initializing method applied to the pixel driving circuit of the above aspect, the method comprising:
in the non-lighting stage of the lighting unit, the initialization module is connected with a lighting control signal sent by a lighting control signal line to initialize the lighting 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 initializing 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 initializing 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 a 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 a 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 reference voltage signal line in the related art is replaced by the light-emitting control signal line, the internal wiring of the display panel is saved, the resolution of the display panel and the flexibility of the panel are improved, and the resolution and the flexibility 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 that are needed 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 other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a circuit configuration diagram of a related art pixel driving circuit.
Fig. 2 is a schematic diagram of an alternative circuit structure of a pixel driving circuit according to an embodiment of the application.
Fig. 3 is a schematic diagram of another alternative circuit configuration of the pixel driving circuit according to an embodiment of the application.
Fig. 4 is a signal timing diagram of a pixel driving circuit according to an embodiment of the application.
Fig. 5 is a schematic diagram of still another alternative circuit configuration of the pixel driving circuit according to an embodiment of the application.
Fig. 6 is a schematic diagram of still another alternative circuit configuration of the pixel driving circuit according to an embodiment of the application.
Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the application.
In the accompanying drawings:
the positive power supply signal PVDD, the first scan signal line S1, the second scan signal line S2, the light emission control signal line EM, the data signal line Vdata, the pixel driving circuit 1, the light emitting unit 2, the driving module 11, the light emission control module 12, the initialization module 13, the compensation module 14, the data writing module 15, the memory module C1, the initialization stage T1, the compensation stage T2, the light emission stage T3, the driving transistor T0, the first initialization transistor T1, the second initialization transistor T2, the first light emission control transistor T3, the second light emission control transistor T4, the compensation transistor T5, and the data writing transistor T6.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the patent. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless specifically defined otherwise. Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its 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 explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In order to explain the technical scheme of the application, the following is detailed with reference to the specific drawings and embodiments.
As described in the background art, with the development of display technology, a new generation of OLED (Organic Light-Emitting Diode) display panels are becoming mainstream. In recent years, various display terminals based on an OLED display panel advocate curved screens and high definition, so that one of the main development directions of the OLED display panel is a flexible OLED with high definition.
Whereas the OLED display panel displays high definition, the driving of the internal pixel driving circuit is not separated, referring to fig. 1, fig. 1 shows a related art pixel driving circuit connected to a light emitting unit. It is typically a 7T1C structure, i.e. the pixel driving circuit is made up of 7 TFTs (Thin Film Transistor, thin film field effect transistors) which are PMOS transistors, and one capacitor.
In addition, in order to enable the display panel to normally realize switching of image frames while ensuring normal display of each frame, the pixel driving circuit also needs to receive various control signals.
The control signals may include a data signal, a scan signal, a light emission control signal, a reference voltage signal, and the like. These control signals are all connected with each TFT through control signal lines to realize signal transmission, so that after the display panel is manufactured, the internal circuits are numerous.
However, the current situation of the large number of internal circuits is unfavorable for the high resolution of the display panel, and reduces the flexibility and the resolution, so that the development direction of the pixel driving circuit in the related art is not consistent with the development direction of the OLED.
In addition, the Display panel is internally provided with enough power supplies, and the reference voltage lines in the control signal lines are arranged, so that one more power supply is needed to be arranged in a Display Driver IC (DDIC) of the Display panel, the power consumption of the Display Driver IC is increased, and the manufacturing cost is increased.
In order to solve the above technical problems, the present application provides a pixel driving circuit, an initializing method, a display panel and a display device, and the following description first describes a pixel driving circuit according to an embodiment of the present application.
Referring to fig. 2, fig. 2 is a schematic diagram showing an alternative circuit configuration of an example of the pixel driving circuit 1 according to the embodiment of the present application. In this example, the above-described pixel driving circuit 1 may include:
a driving module 11, which driving module 11 may be used to provide a driving current for the light emitting unit 2.
And the control end of the light-emitting control module 12 is connected with a light-emitting control signal line EM. The light emission control module 12 may be used to selectively allow the light emitting unit 2 to enter a light emission stage according to a light emission control signal emitted from the light emission control signal line EM.
The initialization module 13 may be configured to access a light emission control signal during a non-light emission phase of the light emitting unit 2 to initialize the light emitting unit 2 and the driving module 11, where the light emission control signal during the non-light emission phase is different from the light emission control signal during the light emission phase.
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 Electroluminescence Display), or other Light Emitting semiconductor.
For example, when the light emitting unit 2 is an OLED, the above-described pixel driving circuit 1 may be applied to an OLED display panel, particularly a flexible OLED display panel.
With continued reference to fig. 2, the process of driving the light emitting unit 2 by the pixel driving circuit 1 may include at least an initialization phase, a data writing phase, a compensation phase and a light emitting phase. Wherein the distinction is made in such a way that the light emitting unit 2 is in a light emitting state, and the other phases than the light emitting phase may be referred to as a non-light emitting phase. 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-light emitting stage, the light emission control signal line EM may keep the light emission control module 12 off.
In this case, the emission control signal line EM may be connected to the initialization module 13 by using the emission control signal emitted from the emission control signal line EM in the non-emission stage, instead of the reference voltage signal line in the related art. The initialization module 13 may switch in a light emission control signal at a non-light emission stage of the light emitting unit 2, and then initialize the light emitting unit 2 and the driving module 11 by means of the light emission 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 the pixel drive design scheme, reduced the internal circuit, be favorable to improving resolution and panel flexibility, also avoid showing drive IC to increase the power again, practiced thrift manufacturing cost, compared the product consumption that has reduced of correlation technique.
Namely, the pixel driving circuit 1 of the embodiment of the application is provided with the driving module 11, the light-emitting control module 12 and the initialization module 13, wherein the driving module 11 can provide driving current for the light-emitting unit 2; the control end of the light-emitting control module 12 is connected with a 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 a light-emitting control signal sent by the light-emitting control signal line EM; and because the light emission control signal line EM to which the light emission control module 12 is connected is also used to access the initialization module 13 in the non-light emission phase 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 the reference voltage signal line in the related technology, the internal wiring of the display panel is saved, the resolution of the display panel and the flexibility of the panel are improved, and the resolution and the flexibility 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 chart showing the light emission control signal emitted from the light emission control signal line EM and the control signal emitted from the first scan 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 application, the control terminal of the initialization module 13 in the pixel driving circuit 1 may be connected to the first scan signal line S1, the input terminal of the initialization module 13 may be connected to the emission control signal line EM, and the output terminal of the initialization module 13 may be connected to the control terminal of the driving module 11 and the light emitting unit 2.
It may be exemplified that the output of the initialization module 13 is connected to the anode of the light emitting unit 2.
The initialization module 13 may be further configured to cut off according to the low level signal emitted by the first scan 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 given in which different level signals emitted from the first scanning signal line S1 control whether the initialization module 13 performs the initialization function.
For the control terminal of the initialization module 13, the high level signal emitted from the first scan signal line S1 can be considered as an active signal. When the first scan signal line S1 sends out a low level signal, the initialization module 13 is not turned on, and no matter what state the emission control signal line EM connected to the input end of the initialization module 13 sends out, it cannot be fed back to the initialization module 13 and the driving module 11. In the present embodiment, it is defined that the first scan signal may be in the light-emitting stage T3 when it emits a low-level signal, so that it can be ensured that the initialization module 13 in this stage does not interfere with the rest of the pixel driving circuit 1, thereby helping to achieve precise control.
With continued reference to fig. 3 and 4, in still other alternative embodiments of the pixel driving circuit 1 of the present application, the non-light emitting phase may include an initialization phase T1 and a compensation phase T2 sequentially arranged.
The initialization module 13 may be specifically configured to conduct, in the initialization stage T1, according to a high level signal sent by the first scanning signal line S1, to access a light emission control signal, to initialize the light emitting unit 2 and the driving module 11.
The initialization module 13 may also be turned off according to the low level signal emitted from the first scan signal line S1 in the compensation stage T2.
Note that, the control terminal of the initialization module 13 may consider the high-level signal emitted from the first scan signal line S1 as an active signal. When the initialization stage T1 is in the non-light-emitting stage, the initialization module 13 is turned on after being controlled, the initialization module 13 is started to provide the light-emitting control signal sent by the light-emitting control signal line EM as an initialization signal to the driving module 11 and the light-emitting unit 2, so that the driving module 11 is initialized before use, and the light-emitting unit 2 is initialized before light emission, thereby replacing the reference voltage signal line in the related art and saving the internal wiring of the display panel.
In addition, the embodiment further defines that the first scan signal may be in the compensation stage T2 when it sends out the low level signal, so that it can be ensured that the initialization module 13 in this stage will not interfere with the rest of the pixel driving circuit 1, thereby helping to achieve precise control.
In still other alternative examples, referring 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 phase T2.
In addition, although a thin film transistor is generally used as a switching element in a display panel, it is easy to cause threshold voltage shift due to the characteristic difference thereof, and when the thin film transistor is provided in the driving module 11, the threshold voltage shift phenomenon is easy to cause display unevenness of the display panel, and for this reason, it is necessary to improve such 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 or off, the phenomenon of threshold voltage drift is prevented, and the phenomenon of uneven display 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.
The control electrode of the first initializing transistor T1 may be connected to the first scanning signal line S1, the first electrode of the first initializing transistor T1 may be connected to the light emission control signal line EM, and the second electrode of the first initializing transistor T1 may be connected to the control end of the driving module 11.
The control electrode of the second initializing transistor T2 may be connected to the first scanning signal line S1, the first electrode of the second initializing transistor T2 is connected to the light emission control signal line EM, and the second electrode of the second initializing transistor T2 may be connected to the light emitting unit 2.
That is, two NMOS type initialization transistors are provided for the driving module 11 and the light emitting unit 2 in the present embodiment, and the control electrode of the initialization transistor may be the gate electrode of the initialization transistor. In the initialization stage T1, the first scan signal line S1 is at a high level, and at this time, the first initialization transistor T1 and the second initialization transistor T2 are turned on, and the light emission control signal sent by the light emission control signal line EM is at a low level, so that the control terminal of the driving module 11 and the anode potential of the light emitting unit 2 can be pulled down, and the initialization of the driving module 11 and the light emitting unit 2 is implemented.
It should be noted that, the light emission control signal generally consumes a relatively large amount of power when controlling light emission, and requires a relatively small amount of current to initialize the control terminal of the driving module 11 and the anode of the light emitting unit 2, so that the light emission control signal in the non-light emission stage can completely meet the initialized current requirement. Therefore, the multiplexing method of the luminous control signal line EM is provided, internal wiring of the display panel is saved, the resolution and the panel flexibility are improved, and the resolution and the flexibility bending degree of the display panel are improved.
Referring to fig. 5 together with fig. 4, fig. 5 is a schematic diagram of an alternative circuit structure of the pixel driving circuit 1 according to an embodiment of the application, and the signal timings of the signals in fig. 4 are also applicable. In this alternative example, the light emission control module 12 described above may include a light emission control transistor. The light emission control transistor may be used to allow the light emitting unit 2 to enter the light emission stage T3 upon receiving a high level signal emitted from the light emission control signal line EM. The light emission control transistor may also control the light emitting unit 2 to enter a non-light emission stage upon receiving a low level signal emitted from the light 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 aforementioned initialization transistor. When the light emitting unit 2 is in a non-light emitting stage, the light emitting control signal line EM can output a light emitting control signal in a low level state, and at this time, the light emitting control signal in the low level state can be multiplexed into an initialization signal to help to initialize the driving module 11 and the light emitting unit 2. While in the light emitting stage T3 of the light emitting unit 2, the light emission control signal line EM outputs a light emission control signal in a high level state, and the light emission control transistor is turned on, thereby allowing the light emitting unit 2 to enter the light emitting stage T3.
The present embodiment provides a timing control scheme of the light emission control module 12, so as to realize multiplexing of the light emission control signal lines EM at different stages, and indirectly save internal wiring of the display panel.
In other embodiments, referring 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 each of the first light-emitting control transistor T3 and the second light-emitting control transistor T4 may be an NMOS transistor.
The control electrode of the first light emitting control transistor T3 may be connected to the light emitting control signal line EM, the first electrode of the first light emitting control transistor T3 may be connected to the positive power supply signal PVDD, and the second electrode of the first light emitting control transistor T3 may be connected to the first end of the driving module 11.
The control electrode of the second light emission control transistor T4 may be connected to the light emission control signal line EM, the first electrode of the second light emission control transistor T4 may be connected to the second end of the driving module 11, and the second electrode of the second light emission control transistor T4 may be connected to the light emission unit 2.
Note that, similarly to the arrangement of the initialization transistor described above, the light emission control transistor is also limited to an NMOS-type transistor in this embodiment, as compared with the related art.
In combination with the above-mentioned setting of the light emission control module 12, in the initialization stage T1 of the light emission stage T3 and the non-light emission stage, the light emission control signal and the control signal sent by 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 and the first light emission control transistor T3 and the second light emission control transistor T4 are turned off in the initialization stage T1.
In the light emitting stage T3, the first and second initialization transistors T1 and T2 are turned off, and the first and second light emission control transistors T3 and T4 are turned on. Thereby realizing accurate selective turn-on of transistors with different functions at different stages.
The present embodiment gives an alternative structure of the emission control module 12, providing a technical basis for multiplexing 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-described process are described in detail below with reference to fig. 4 and 6.
First, the pixel driving circuit 1 may further include a data writing module 15 and a storage module C1. Wherein the data writing module 15 may be used to selectively provide the data signals to the driving module 11. The memory module C1 may be used to maintain the potential of the control terminal of the driving module 11 in the light emitting phase T3.
The driving module 11 may include a driving transistor T0, the storage module C1 may be a capacitor, and a first terminal of the capacitor may be connected to the positive power signal PVDD, and a second terminal of the capacitor 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 end 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 be PMOS transistors.
In the initialization phase T1, only the light emission control signal is at low level, and both the first scan signal (i.e., the control signal sent from the first scan signal line S1) and the second scan signal (i.e., the control signal sent from the second scan signal line S2) are at high level. At this time, the first and second light emission control transistors T3 and T4 are turned off, the first and second initialization transistors T1 and T2 are turned on, and the low-level light emission control signal replaces the reference voltage signal line in the related art to initialize the gate of the driving transistor T0 and the anode of the light emitting unit 2 (e.g., OLED).
In the compensation phase T2, the light emission control signal, the first scan signal and the second scan signal are all at low level, at this time, the first light emission control transistor T3 and the second light emission control transistor T4 are kept turned off, the first initialization transistor T1 and the second initialization transistor T2 are turned off, the data writing transistor T6 and the compensation transistor T5 are turned on, and the compensation transistor T5 compensates the threshold voltage of the driving transistor T0, thereby writing the threshold voltage into the gate of the driving transistor T0 can be realized.
In the light emitting stage T3, the light emitting 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 control transistors T3 and T4 are turned on, the driving transistor T0 is turned on, and the first and second initialization transistors T1, T2 and the compensation transistor T5 are turned off, whereby the light emitting unit 2 emits light.
The above embodiments explain the pixel driving circuit of the present application, and the following proposes an initialization method of the present application based on the pixel driving circuit of the above embodiments, which may include:
in the non-lighting stage of the lighting unit, the initialization module is connected with a lighting control signal sent by a lighting control signal line to initialize the lighting unit and the driving module.
According to the embodiment of the application, the reference voltage signal line in the related technology is replaced by the light-emitting control signal line, so that the internal wiring of the display panel is saved, the resolution of the display panel and the flexibility of the panel are improved, and the resolution and the flexibility bending degree of the display panel are improved.
On the basis of the pixel driving circuit embodiment, 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 provided by the embodiment, and the display device comprises the display panel, so that the display device and the display panel have all the beneficial effects of the display panel.
In addition, the term "and/or" is merely an association relationship describing the association object, and means that three relationships may exist, for example, a and/or B,
it can be expressed that: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that in embodiments of the present application, "B corresponding to a" means that B is associated with a, from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A pixel driving circuit, the 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 is used for selectively allowing the light-emitting unit to enter a light-emitting stage according to a light-emitting control signal sent by the light-emitting control signal line;
and 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, wherein the light-emitting control signal in the non-light-emitting stage is different from the light-emitting control signal in the light-emitting stage.
2. The pixel driving circuit according to claim 1, wherein a control end of the initializing module is connected to a first scanning signal line, an input end of the initializing module is connected to the light emission control signal line, and an output end of the initializing module is connected to a control end of the driving module and the light emitting unit;
the initialization module is further configured to cut off, in the light emitting stage, a low-level signal sent by the first scanning signal line.
3. The pixel driving circuit according to claim 2, wherein the initialization module comprises a first initialization transistor and a second initialization transistor, each of the first and second initialization transistors being an NMOS transistor;
the control electrode of the first initializing transistor is connected with the first scanning signal line, the first electrode of the first initializing transistor is connected with the light-emitting control signal line, and the second electrode of the first initializing transistor is connected with the control end of the driving module;
the control electrode of the second initializing transistor is connected with the first scanning signal line, the first electrode of the second initializing transistor is connected with the light-emitting control signal line, and the second electrode of the second initializing transistor is connected with the light-emitting unit.
4. The pixel driving circuit according to claim 2, wherein the non-light emitting stage includes an initialization stage and a compensation stage which are sequentially arranged;
the initialization module is specifically configured to conduct according to a high-level signal sent by the first scanning signal line in the initialization stage, so as to access the light-emitting control signal, and initialize the light-emitting unit and the driving module;
the initialization module is further specifically configured to cut off, in the compensation stage, the low-level signal sent by the first scanning signal line.
5. The pixel driving circuit according to claim 4, wherein 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 the compensation stage.
6. A pixel driving circuit according to any one of claims 1 to 5, wherein the light emission control module comprises:
a light emission control transistor for allowing the light emitting unit to enter a light emission stage when receiving a high level signal emitted from the light emission control signal line; and when receiving the 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 includes a first light emission control transistor and a second light emission control transistor, each of the first light emission control transistor and the second light emission control transistor being an NMOS transistor;
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 a positive power supply 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.
8. An initialization method applied to the pixel driving 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 with 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 comprising 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 according to any one of claims 1 to 7.
10. A display device comprising the display panel according to claim 9.
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| CN114913815A (en) | 2022-08-16 |
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