CN110322842B - Pixel driving circuit and display device - Google Patents
Pixel driving circuit and display device Download PDFInfo
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- CN110322842B CN110322842B CN201910425125.1A CN201910425125A CN110322842B CN 110322842 B CN110322842 B CN 110322842B CN 201910425125 A CN201910425125 A CN 201910425125A CN 110322842 B CN110322842 B CN 110322842B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
The invention discloses a pixel driving circuit and a display device, wherein the pixel driving circuit comprises a driving module, a data writing module, a storage module and a first initialization module, the driving module is used for providing driving current for an organic light-emitting structure, the organic light-emitting structure responds to the driving current to emit light, the data writing module is used for writing a data signal into a control end of the driving module in a data writing stage, the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage, the first initialization module is used for initializing the potential of the control end of the driving module in the initialization stage, a thin film transistor forming the first initialization module is an oxide thin film transistor, and at least one oxide transistor is a thin film transistor with a multi-gate structure. Through the technical scheme of the invention, the normal driving function of the pixel driving circuit is realized, and simultaneously, the stability of the control end voltage of the driving module is improved, so that the display effect of the display device is optimized.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel driving circuit and a display device.
Background
The organic light emitting display device generally includes a plurality of pixels, each of the pixels includes a pixel driving circuit and an organic light emitting structure, the pixel driving circuit provides a driving current to the organic light emitting structure, the organic light emitting structure emits light in response to the driving current provided by the pixel driving circuit, and the organic light emitting display device realizes display.
The pixel driving circuit comprises a driving transistor which generates a driving current for driving the organic light-emitting structure to emit light. At present, in the working process of a pixel driving circuit, the grid of a driving transistor has the problem of electric leakage, and the display effect of a display device is influenced.
Disclosure of Invention
The invention provides a pixel driving circuit and a display device, which improve the stability of the control end voltage of a driving module while realizing the normal driving function of the pixel driving circuit, thereby optimizing the display effect of the display device.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including:
a driving module for supplying a driving current to an organic light emitting structure, the organic light emitting structure emitting light in response to the driving current;
the data writing module is used for writing a data signal into the control end of the driving module in a data writing stage;
the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage;
the first initialization module is used for initializing the potential of the control end of the driving module in an initialization stage; the thin film transistors forming the first initialization module are oxide thin film transistors, and at least one oxide transistor is a thin film transistor with a multi-gate structure.
Further, the pixel driving circuit further includes:
a second initialization module for initializing a potential of the first electrode of the organic light emitting structure in the initialization stage; the thin film transistor forming the second initialization module is an oxide thin film transistor with a multi-gate structure.
Further, the first initialization module comprises a first initialization sub-module and a second initialization sub-module, and at least one of the first initialization sub-module and the second initialization sub-module is turned off in the data writing phase and the light emitting phase; and the thin film transistors forming the first initialization submodule and the second initialization submodule are oxide thin film transistors.
Furthermore, the control end of the first initialization sub-module is electrically connected with the control end of the data writing module, the first end of the first initialization sub-module is electrically connected with the first end of the second initialization sub-module, and the second end of the first initialization sub-module is electrically connected with the control end of the driving module; the thin film transistor forming the data writing module is a P-type thin film transistor;
and the control end of the second initialization submodule is electrically connected with the control end of the second initialization module, and the first end of the second initialization submodule is accessed into a reference signal.
Further, the first initialization module is turned off in the data writing phase and the light emitting phase.
Further, the pixel driving circuit further includes:
and the reverse module comprises a reverse input end and a reverse output end, and the reverse output end is electrically connected with the control end of the first initialization module.
Further, the reverse module comprises a first reverse submodule and a second reverse submodule;
the control end of the first reverse sub-module is electrically connected with the control end of the second reverse sub-module to serve as a reverse input end of the reverse module, the first end of the first reverse sub-module is connected with a first power signal, and the second end of the first reverse sub-module is electrically connected with the second end of the second reverse sub-module;
a first end of the second reverse submodule is connected to a second power supply signal; the thin film transistor forming the first reverse sub-module is a P-type thin film transistor, and the thin film transistor forming the second reverse sub-module is an oxide thin film transistor.
Further, the control end of the second initialization module is electrically connected with the control end of the first initialization module.
Further, the pixel driving circuit further includes:
at least one light emission control module for controlling the organic light emitting structure not to emit light before the light emission phase;
the control end of the second initialization module is electrically connected with the control end of the light-emitting control module; wherein, the thin film transistor forming the light emitting control module is a P-type thin film transistor.
In a second aspect, embodiments of the present invention further provide a display device, where the display device includes the pixel driving circuit according to the first aspect.
The embodiment of the invention provides a pixel driving circuit and a display device, wherein the pixel driving circuit comprises a driving module, a data writing module, a storage module and a first initialization module, the driving module is used for providing driving current for an organic light-emitting structure, the organic light-emitting structure responds to the driving current to emit light, the data writing module is used for writing data signals into a control end of the driving module in a data writing stage, the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage, the first initialization module is used for initializing the potential of the control end of the driving module in an initialization stage, a thin film transistor forming the first initialization module is an oxide thin film transistor, at least one oxide transistor is a thin film transistor with a multi-gate structure, the normal driving function of the pixel driving circuit is realized, and the first initialization module formed by the oxide thin film transistor effectively reduces the first initialization module in the data writing stage and the light-emitting stage The leakage current generated by the initialization module improves the stability of the control end voltage of the driving module, and further optimizes the display effect of the display device.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a specific circuit structure of a pixel driving circuit according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
fig. 4 is a schematic circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another specific circuit structure of a pixel driving circuit according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the invention;
fig. 8 is a schematic circuit diagram of another specific circuit structure of a pixel driving circuit according to an embodiment of the invention;
FIG. 9 is a driving timing diagram of the pixel driving circuit of FIG. 2;
FIG. 10 is a timing diagram of the driving of the pixel driving circuit of the structure shown in FIG. 4;
FIG. 11 is a timing diagram of the driving of the pixel driving circuit of the structure shown in FIG. 6;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The embodiment of the invention provides a pixel driving circuit which comprises a driving module, a data writing module, a storage module and a first initialization module, wherein the driving module is used for providing driving current for an organic light-emitting structure, the organic light-emitting structure responds to the driving current to emit light, the data writing module is used for writing a data signal into a control end of the driving module in a data writing stage, the storage module is used for maintaining the electric potential of the control end of the driving module in a light-emitting stage, the first initialization module is used for initializing the electric potential of the control end of the driving module in an initialization stage, a thin film transistor forming the first initialization module is an oxide thin film transistor, and at least one oxide transistor is a thin film transistor with a multi-gate structure.
The organic light emitting display device generally includes a plurality of pixels, each of the pixels includes a pixel driving circuit and an organic light emitting structure, the pixel driving circuit provides a driving current to the organic light emitting structure, the organic light emitting structure emits light in response to the driving current provided by the pixel driving circuit, and the organic light emitting display device realizes display. The pixel driving circuit comprises a driving transistor, the driving transistor generates a driving current for driving the organic light-emitting structure to emit light, namely, the light-emitting brightness of the organic light-emitting structure depends on the driving current generated by the driving transistor, and the driving current generated by the driving transistor is directly related to the grid potential of the driving transistor. At present, in the working process of a pixel driving circuit, the grid electrode of a driving transistor has the problem of electric leakage, so that the grid electrode potential of the driving transistor is unstable, and the display effect of a display device is influenced.
The pixel driving circuit provided by the embodiment of the invention comprises a driving module, a data writing module, a storage module and a first initialization module, wherein the driving module is used for providing driving current for an organic light-emitting structure, the organic light-emitting structure responds to the driving current to emit light, the data writing module is used for writing a data signal into a control end of the driving module in a data writing stage, the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage, the first initialization module is used for initializing the potential of the control end of the driving module in the initialization stage, a thin film transistor forming the first initialization module is an oxide thin film transistor, at least one oxide transistor is a thin film transistor with a multi-gate structure, the normal driving function of the pixel driving circuit is realized, and meanwhile, the first initialization module formed by the oxide thin film transistor effectively reduces the leakage current generated by the first initialization module in the data writing stage and the light-emitting stage, the problem of the control end electric leakage of the driving module is solved, the stability of the control end voltage of the driving module is improved, and the display effect of the display device is optimized.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a specific circuit of a pixel driving circuit according to an embodiment of the present invention. Referring to fig. 1 and 2, the pixel driving circuit includes a driving module 1 and a data writing module 2, the driving module 1 is used for providing a driving current Id to the organic light emitting structure a, the organic light emitting structure a emits light in response to the driving current Id, the data writing module 2 is used for writing a data signal into the control terminal a1 of the driving module 1 in a data writing phase, a path of writing the data signal into the control terminal a1 of the driving module 1 by the data writing module 2 is shown as a path L1 in fig. 1, the memory module 3 is used for maintaining the potential of the control terminal a1 of the driving module 1 in the light emitting phase, the first initializing module 4 is used for initializing the potential of the control terminal a1 of the driving module 1 in the initializing phase, the thin film transistors forming the first initializing module 4 are oxide thin film transistors, and at least one oxide transistor is a thin film transistor with a multi-gate structure.
Specifically, referring to fig. 1 and fig. 2, the first initialization module 4 initializes the potential of the control terminal a1 of the driving module 1 in the initialization phase, after the pixel driving circuit enters the data writing phase and the light emitting phase, the first initialization module 4 is turned off, and the leakage current generated by the first initialization module 4 directly affects the leakage current of the control terminal a1 of the driving module 1, i.e., affects the stability of the potential of the control terminal a1 of the driving module 1. The thin film transistor forming the first initialization module 4 is an oxide thin film transistor, for example, a channel material of the thin film transistor forming the first initialization module 4 may be IGZO (indium gallium zinc oxide), and a leakage current generated when the oxide thin film transistor is turned off is small, for example, compared with an LTPS (low temperature polysilicon) thin film transistor commonly used at present, the leakage current generated when the oxide thin film transistor is turned off is smaller, so that, while a normal driving function of the pixel driving circuit is realized, the leakage current generated by the first initialization module 4 in a data writing stage and a light emitting stage is effectively reduced by forming the first initialization module 4 with the oxide thin film transistor, a problem of leakage current at the control end a1 of the driving module 1 is improved, stability of voltage at the control end a1 of the driving module 1 is improved, and a display effect of the display device is optimized.
In addition, at least one oxide transistor constituting the first initialization module 4 may be a multi-gate thin film transistor, which is beneficial to further reduce leakage current generated when the first initialization module 4 is turned off, improve the stability of the voltage at the control terminal a1 of the driving module 1, and optimize the display effect of the display device, compared to a single-gate thin film transistor. In addition, the LTPS thin film transistor relates to a process of changing amorphous silicon into polycrystalline silicon in the manufacturing process, the uniformity of channel materials is poor, the switching characteristics of the LTPS thin film transistor are affected, the uniformity of communication materials of the oxide thin film transistor is good, and the thin film transistor forming the first initialization module 4 is set to be the oxide thin film transistor, so that the switching characteristics of the first initialization module 4 can be optimized, and the display effect of the display device can be further optimized.
Alternatively, in conjunction with fig. 1 and 2, the pixel driving circuit may further include a second initialization module 5, where the second initialization module 5 is configured to initialize the potential of the first electrode a1 of the organic light emitting structure a in an initialization phase, the thin film transistor constituting the second initialization module 5 may be configured as an oxide thin film transistor with a multi-gate structure, and fig. 2 exemplarily configures the thin film transistor constituting the second initialization module 5 as an oxide thin film transistor with a double-gate structure.
Specifically, with reference to fig. 1 and fig. 2, the second initialization module 5 initializes the potential of the first electrode a1 of the organic light emitting structure a in the initialization phase, after the pixel driving circuit enters the light emitting phase, the second initialization module 5 is turned off, the leakage current generated by the second initialization module 5 directly affects the leakage current of the first electrode a1 of the organic light emitting structure a, that is, affects the stability of the potential of the first electrode a1 of the organic light emitting structure a, the thin film transistor constituting the second initialization module 5 is an oxide thin film transistor, for example, the channel material of the thin film transistor constituting the second initialization module 5 may be IGZO, the leakage current generated by the oxide thin film transistor when turned off is small, for example, the leakage current generated when turned off is smaller compared with the LTPS thin film transistor commonly used at present, so that, while the normal driving function of the pixel driving circuit is realized, the second initialization module 5 formed by the oxide thin film transistor effectively reduces the leakage current generated by the second initialization module 5 in the light emitting stage, improves the leakage current of the first electrode A1 of the organic light emitting structure A in the light emitting stage, improves the voltage stability of the first electrode A1 of the organic light emitting structure A, and further optimizes the display effect of the display device. In addition, the thin film transistor forming the second initialization module 5 is an oxide thin film transistor with a multi-gate structure, and compared with the thin film transistor with a single-gate structure, the thin film transistor with the multi-gate structure is beneficial to further reducing leakage current generated when the second initialization module 5 is turned off, improving the stability of the voltage of the first electrode a1 of the organic light emitting structure a, and optimizing the display effect of the display device. Similarly, the uniformity of the communication material of the oxide thin film transistor is good, and the thin film transistor constituting the second initialization module 5 is set to be the oxide thin film transistor, which is beneficial to optimizing the switching characteristic of the second initialization module 5, and further optimizing the display effect of the display device.
Alternatively, with reference to fig. 1 and fig. 2, the first initialization module 4 may include a first initialization sub-module 41 and a second initialization sub-module 42, at least one of the first initialization sub-module 41 and the second initialization sub-module 42 is turned off in the data writing stage and the light emitting stage, and the thin film transistors constituting the first initialization sub-module 41 and the second initialization sub-module 42 are oxide thin film transistors.
Specifically, referring to fig. 1 and 2, the first initialization sub-module 4 includes a first initialization sub-module 41 and a second initialization sub-module 42, and at least one of the first initialization sub-module 41 and the second initialization sub-module 42 is turned off, and the thin film transistors constituting the first and second initialization sub-modules 41 and 42 are oxide thin film transistors, so that in the data writing stage and the light emitting stage, the turned-off sub-modules of the first initialization sub-module 41 and the second initialization sub-module 42, which are formed using oxide thin film transistors, the normal driving function of the pixel driving circuit is realized, meanwhile, the leakage current generated by the first initialization module 4 is effectively reduced, the problem of electric leakage of the control end a1 of the driving module 1 is solved, the stability of the voltage of the control end a1 of the driving module 1 is improved, and the display effect of the display device is optimized.
For example, the oxide thin film transistor forming the first initialization sub-module 41 may be an oxide thin film transistor with a multi-gate structure, or the oxide thin film transistor forming the second initialization sub-module 42 may be an oxide thin film transistor with a multi-gate structure, or both the oxide thin film transistors forming the first initialization sub-module 41 and the second initialization sub-module 42 may be oxide thin film transistors with a multi-gate structure, so as to further reduce a leakage current generated when the first initialization module 4 is turned off, improve the stability of the voltage at the control terminal a1 of the driving module 1, and optimize the display effect of the display device.
Alternatively, in conjunction with fig. 1 and 2, the control terminal a1 of the first initialization submodule 41 may be arranged to be electrically connected with the control terminal a1 of the data writing module 2, that is, the control terminal a1 of the first initialization submodule 41 and the control terminal a1 of the data writing module 2 are both configured to receive the first scan signal S1, the first terminal a2 of the first initialization submodule 41 is electrically connected to the first terminal a2 of the second initialization submodule 42, the second terminal a3 of the first initialization submodule 41 is electrically connected to the control terminal a1 of the driving module 1, the control terminal a1 of the second initialization submodule 42 is electrically connected to the control terminal a1 of the second initialization module 5, that is, the control terminal a1 of the second initialization submodule 42 and the control terminal a1 of the second initialization submodule 5 may both be connected to the enable signal EM, the first terminal a2 of the second initialization submodule 42 is connected to the reference signal Vref, and the thin film transistors constituting the data writing module 2 are P-type thin film transistors.
Specifically, with reference to fig. 1 and fig. 2, the first initialization module 4 initializes the potential of the control terminal a1 of the driving module 1 in an initialization stage, in the initialization stage, the first initialization submodule 41 and the second initialization submodule 42 can be controlled to be both turned on, and the reference signal Vref is written into the control terminal a1 of the driving module 1 through the second initialization submodule 42 and the first initialization submodule 41 to initialize the potential of the control terminal a1 of the driving module 1.
In addition, the control terminal a1 of the first initialization submodule 41 is electrically connected to the control terminal a1 of the data writing module 2, the thin film transistor constituting the first initialization submodule 41 is an oxide thin film transistor, i.e., an N-type thin film transistor, the thin film transistor constituting the data writing module 2 is a P-type thin film transistor, and for example, the thin film transistor constituting the data writing module 2 may be an LTPS thin film transistor, so that the data writing module 2 has advantages of high mobility, small parasitic capacitance, high stability, and the like. Thus, under the control of the enable signal EM, the switching states of the data writing module 2 and the first initialization submodule 41 are just opposite, that is, in the initialization stage, the data writing module 2 is turned off, the first initialization submodule 41 is turned on so as to initialize the potential of the control terminal a1 of the driving module 1, in the data writing stage, the first initialization submodule 41 is turned off, the data writing module 2 is turned on so as to write the data signal into the control terminal a1 of the driving module 1, the control terminal a1 of the first initialization submodule 41 is electrically connected with the control terminal a1 of the data writing module 2, and while the pixel driving circuit is facilitated to realize the normal driving function, the control of the data writing module 2 and the first initialization submodule 41 can be realized only by one scanning signal line, so that the number of the scanning signal lines electrically connected with the pixel driving circuit is reduced, and further, the number of scanning circuits in a non-display area of the display device is reduced, and the realization of a narrow frame of the display device is facilitated.
Similarly, the control end a1 of the second initialization sub-module 42 is electrically connected to the control end a1 of the second initialization module 5, and both of them need to be turned on in the initialization stage, so that the pixel driving circuit can realize the normal driving function, and at the same time, the second initialization sub-module 42 and the second initialization module 5 can be controlled by only one scanning signal line, thereby reducing the number of scanning signal lines electrically connected to the pixel driving circuit, and also being beneficial to realizing the narrow frame of the display device.
Fig. 3 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of a specific circuit of another pixel driving circuit according to an embodiment of the present invention. Unlike the pixel driving circuit having the structure shown in fig. 1 and 2, the first initialization module 4 in the pixel driving circuit having the structure shown in fig. 3 and 4 is not divided into different initialization sub-modules, and is set in the data writing stage and the light emitting stage, and the first initialization module 4 is turned off. For example, the first initialization module 4 may include an oxide thin film transistor T4, and in the data writing stage and the light emitting stage, the first initialization module 4 formed by the oxide thin film transistor T4 is turned off, which is beneficial to achieving the normal driving function of the pixel driving circuit, and at the same time, effectively reducing the leakage current generated by the first initialization module 4 in the data writing stage and the light emitting stage, improving the problem of the leakage current at the control terminal a1 of the driving module 1, improving the stability of the voltage at the control terminal a1 of the driving module 1, and further optimizing the display effect of the display device.
For example, as shown in fig. 4, the oxide transistor T4 constituting the first initialization module 4 may be configured as a thin film transistor with a multi-gate structure, and the oxide transistor T4 constituting the first initialization module 4 may be configured as a thin film transistor with a double-gate structure in fig. 4, which is beneficial to further reducing the leakage current generated when the first initialization module 4 is turned off, improving the stability of the voltage at the control terminal a1 of the driving module 1, and optimizing the display effect of the display device, compared to the thin film transistor with a single-gate structure.
Fig. 5 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and fig. 6 is a schematic structural diagram of a specific circuit of another pixel driving circuit according to an embodiment of the present invention. On the basis of the pixel driving circuit having the structure shown in fig. 3 and 4, the pixel driving circuit having the structure shown in fig. 5 and 6 further includes an inversion block 6, the inversion block 6 includes an inversion input terminal e1 and an inversion output terminal e2, and the inversion output terminal e2 is electrically connected to the control terminal a1 of the first initialization block 4. Specifically, with reference to fig. 5 and 6, the arrangement of the inverting module 6 is such that the level value of the signal received at the inverting input terminal e1 of the inverting module 6 is opposite to the level value of the signal output by the inverting module 6 to the control terminal a1 of the first initializing module 4 through the inverting output terminal e2, and the arrangement of the inverting module 6 is beneficial to being compatible with different models of driving chips while ensuring normal timing control of the first initializing module 4.
Alternatively, with reference to fig. 5 and 6, the reverse module 6 may include a first reverse sub-module 61 and a second reverse sub-module 62, a control terminal a1 of the first reverse sub-module 61 and a control terminal a1 of the second reverse sub-module 62 are electrically connected as a reverse input terminal e1 of the reverse module 6, a first terminal a2 of the first reverse sub-module 61 is connected to the first power signal VDD, a second terminal a3 of the first reverse sub-module 61 is electrically connected to a second terminal a3 of the second reverse sub-module 62, a first terminal a1 of the second reverse sub-module 62 is connected to the second power signal VSS, the thin film transistor constituting the first reverse sub-module 61 is a P-type thin film transistor, and the thin film transistor constituting the second reverse sub-module 62 is an oxide thin film transistor.
For example, the level value of the first power signal VDD may be set to a positive value, for example, the first power signal VDD may be set to a power signal of +5V, the level value of the second power signal VSS may be set to a negative value, for example, the second power signal VSS may be set to a power signal of-5V, the first end a2 of the first inversion sub-module 61 is connected to the first power signal VDD, the first end a2 of the second inversion sub-module 62 is connected to the second power signal VSS, the thin film transistor constituting the first inversion sub-module 61 is a P-type thin film transistor, for example, the thin film transistor constituting the first inversion sub-module 61 is an LTPS thin film transistor, the thin film transistor constituting the second inversion sub-module 62 is an oxide thin film transistor, which is an N-type thin film transistor, the inversion function of the inversion module 6 is realized by using a simpler circuit connection structure, and the thin film transistor constituting the first inversion sub-module 61 is an LTPS thin film transistor, the first inversion sub-module 61 is compatible with the rest of the pixel driving circuits, which are made of LTPS thin film transistors, such as the data writing module 2, and the thin film transistors making up the second inversion sub-module 62 are oxide thin film transistors, so that the second inversion sub-module 62 is compatible with the rest of the pixel driving circuits, which are made of oxide thin film transistors, such as the first initialization module 4 and the second initialization module 5, in terms of manufacturing process, and the manufacturing process of the display device is simplified. It should be noted that, in the embodiment of the present invention, specific magnitudes of the level values of the first power supply signal VDD and the second power supply signal VSS are not limited.
Optionally, with reference to fig. 1 to 6, the pixel driving circuit may further include at least one light emitting control module, and the pixel driving circuit of the exemplary device of fig. 1 to 6 includes two light emitting control modules, namely, a first light emitting control module 71 and a second light emitting control module 72, the light emitting control modules are configured to control the organic light emitting structure a not to emit light before the light emitting phase, the control terminal a1 of the second initialization module 5 is electrically connected to the light emitting control modules, namely, the control terminals a1 of the first light emitting control module 71 and the second light emitting control module 72, and the thin film transistors constituting the light emitting control modules, namely, the first light emitting control module 71 and the second light emitting control module 72, are P-type thin film transistors.
Specifically, with reference to fig. 1 to 6, the light-emitting control modules, that is, the first light-emitting control module 71 and the second light-emitting control module 72, are configured to control the organic light-emitting structure a to not emit light before the light-emitting stage, that is, in the initialization stage and the data writing stage, the light-emitting control modules, that is, the first light-emitting control module 71 and the second light-emitting control module 72, are both in an off state, so that the driving modules 1 to the organic light-emitting structure a cannot form a current path, that is, the driving current Id generated by the driving module 1 cannot be transmitted to the organic light-emitting structure a, and the organic light-emitting structure a does not emit light, thereby effectively avoiding the problem of light leakage of the.
In addition, the control terminal a1 of the second initialization module 5 is electrically connected to the control terminals a1 of the light emission control modules, i.e., the first light emission control module 71 and the second light emission control module 72, and the thin film transistors constituting the light emission control modules, i.e., the first light emission control module 71 and the second light emission control module 72, are P-type thin film transistors, for example, the thin film transistors constituting the light emission control modules, i.e., the first light emission control module 71 and the second light emission control module 72, are LTPS thin film transistors, the thin film transistors constituting the second initialization module 5 are oxide thin film transistors, i.e., N-type thin film transistors,
in this way, the on-off states of the light emitting control modules, namely the first light emitting control module 71 and the second light emitting control module 72, and the second initialization sub-module 42 are opposite, that is, the light emitting control modules, namely the first light emitting control module 71 and the second light emitting control module 72, are turned off in the initialization phase, the second initialization sub-module 42 is turned on to initialize the potential of the first electrode a1 of the organic light emitting structure a, in the light emitting phase, the second initialization sub-module 42 is turned off to improve the problem of electric leakage of the first electrode a1 of the organic light emitting structure a, and the stability of the potential of the first electrode a1 of the organic light emitting structure a in the light emitting phase, and the light emitting control modules, namely the first light emitting control module 71 and the second light emitting control module 72, are turned on to enable the driving module 1 to form a current path through the organic light emitting structure a, that is to transmit the driving current, the organic light-emitting structure A emits light, the display device realizes a display function, and thus, when the pixel driving circuit is favorable for realizing a normal driving function, the control of the light-emitting control module, namely the first light-emitting control module 71, the second light-emitting control module 72 and the second initialization sub-module 42, can be realized by only one scanning signal line, the number of the scanning signal lines electrically connected with the pixel driving circuit is reduced, the number of the scanning circuits in the non-display area of the display device is further reduced, and the realization of the narrow frame of the display device is favorable.
Fig. 7 is a schematic structural diagram of another pixel driving circuit according to an embodiment of the present invention, and fig. 8 is a schematic structural diagram of a specific circuit of another pixel driving circuit according to an embodiment of the present invention. Unlike the pixel driving circuit having the structure shown in fig. 5 and 6, in the pixel driving circuit having the structure shown in fig. 7 and 8, the control terminal a1 of the second initialization block 5 is electrically connected to the control terminal a1 of the first initialization block 4, and in the initialization phase, the first initialization block 4 and the second initialization block 5 are both turned on, so as to respectively initialize the control terminal a1 of the driving block 1 and the first electrode a1 of the organic light emitting structure a.
Alternatively, in conjunction with fig. 1 to 8, the pixel driving circuit may further include a threshold compensation module 8, the driving module 1 includes a driving transistor T1, and the threshold compensation module 8 is configured to write a compensation signal containing information of a threshold voltage Vth of the driving transistor T1 into the control terminal a1 of the driving module 1 before the light emitting phase. Specifically, with reference to fig. 1 to 8, the threshold compensation module 8 writes the compensation signal containing the information of the threshold voltage Vth of the driving transistor T1 into the control terminal a1 of the driving module 1 before the light emitting phase, which is beneficial to make the driving current Id flowing through the organic light emitting structure a independent of the threshold voltage Vth of the driving transistor T1 during the light emitting phase, and effectively avoid the problem of display non-uniformity caused by the drift of the threshold voltage Vth of the driving transistor T1.
Fig. 9 is a driving timing diagram of the pixel driving circuit having the structure shown in fig. 2. For example, the driving transistor T1, the data writing transistor T2, the threshold compensation transistor T3, the first light emission control transistor T5 and the second light emission control transistor T6 may be P-type thin film transistors, such as LTPS thin film transistors, and the first initialization sub-transistor T41, the second initialization sub-transistor T42 and the second initialization transistor T7 may be N-type thin film transistors, i.e., oxide thin film transistors, and the following will specifically explain the operation principle of the pixel driving circuit with the structure shown in fig. 2 with reference to fig. 9:
in the T1 (initialization) period, the first, second and third initialization sub-transistors T41, T42 and T7 are connected between the first and second poles b2 and b3, respectively, and the first and second poles b2 and b3 of the remaining transistors are disconnected.
In this case, the reference signal Vref is transmitted to the gate b1 of the driving transistor T1 through the first and second initializing sub-transistors T41 and T42, and the driving transistor T1 is initialized by the reference signal. Likewise, the reference signal Vref is transmitted to the first electrode a1 of the organic light emitting structure a through the second initializing transistor T7, and the first electrode a1 of the organic light emitting structure a is initialized by the reference signal.
In the T2 (data write) period, the second initialization transistor T7, the second initialization sub-transistor T42, the threshold compensation transistor T3, the data write transistor T2 and the drive transistor T1 are connected between the first pole b2 and the second pole b3, respectively, and the first poles b2 and the second poles b3 of the remaining transistors are disconnected.
In this case, the DATA writing transistor T2 writes a DATA signal to the gate b1 of the driving transistor T1, the writing path of the DATA signal is as shown by a path L2 in fig. 2, the driving transistor T1 is equivalent to a diode and forward biased by the threshold compensation transistor T3, a compensation voltage obtained by subtracting an absolute value | Vth | of a threshold voltage Vth of the driving transistor T1 from a voltage Vdata of the DATA signal DATA is applied to the gate b1 of the driving transistor T1, that is, the threshold compensation module 8 writes the compensation signal containing the information of the threshold voltage Vth of the driving transistor T1 into the control terminal a1 of the driving module 1 before the light-emitting phase, when the voltage value at the first terminal d1 of the memory module 3 is equal to the compensation voltage, the voltage value at the second terminal d2 of the memory module 3 is equal to the voltage value VDD of the first power signal VDD, and the charge corresponding to the voltage difference between the first terminal d1 and the second terminal d2 of the memory module 3 is stored in the capacitive element of the memory module 3.
The first initialization submodule 41 formed by the oxide thin film transistor T41 is turned off, so that the normal driving function of the pixel driving circuit is realized, the leakage current generated by the first initialization submodule 4 in the data writing stage is effectively reduced, the problem of leakage current of the control end a1 of the driving module 1 is solved, the stability of the voltage of the control end a1 of the driving module 1 is improved, and the display effect of the display device is optimized.
In the T3 (light emitting) period, the first and second light emission controlling transistors T5, T6, T1 and T41 are connected between the first and second poles b2 and b3, respectively, and the remaining transistors are disconnected between the first and second poles b2 and b 3.
In this case, the first power signal VDD is transmitted to the first pole b2 of the driving transistor T1 through the first emission control transistor T5, and the driving current Id generated by the voltage difference between the voltage of the gate b1 of the driving transistor T1 and the voltage value VDD of the first power signal VDD flows to the organic light emitting structure a through the second emission control transistor T6, and the organic light emitting structure a emits light in response to the driving current Id.
In the T3 time period, since the memory module 3 is electrically connected to the gate b1 of the driving transistor T1 and the memory module 3 can maintain the voltage of the gate b1 of the driving transistor T1 in the light emitting phase, that is, the T3 time period, the voltage Vgs between the gate b1 and the source (first pole b2) of the driving transistor T1 is maintained or substantially maintained (Vdata + Vth) -Vdd by the memory module 3, and the driving current Id and the voltage Vgs between the gate b1 and the source (first pole b2) of the driving transistor T1 are subtracted by the voltage Vgs between the gate b1 and the source (first pole b2) of the driving transistor T1 according to the correspondence of the driving current Id of the driving transistor T1 and the voltage difference between the gate b1 and the source (first pole b 631 threshold voltage Vth squared (Vdata-Vdd)2In proportion, the driving current Id of the driving transistor T1 is not related to the threshold voltage Vth of the driving transistor T1, that is, the pixel driving circuit realizes the capture of the threshold voltage Vth of the driving transistor T1 before the light emitting phase and compensates the threshold voltage Vth of the driving transistor T1 in the light emitting phase, so that the driving current Id flowing through the organic light emitting structure a in the light emitting phase is not related to the threshold voltage Vth of the driving transistor T1, and the problem of display unevenness caused by the drift of the threshold voltage Vth of the driving transistor T1 is effectively avoided.
The turn-off of the second initialization submodule 42 formed by the oxide thin film transistor T42 is beneficial to realizing the normal driving function of the pixel driving circuit, and simultaneously, effectively reduces the leakage current generated by the first initialization module 4 in the light emitting stage, improves the problem of the leakage current of the control end a1 of the driving module 1, and improves the stability of the voltage of the control end a1 of the driving module 1, and the turn-off of the second initialization module 5 formed by the oxide thin film transistor T7 is beneficial to realizing the normal driving function of the pixel driving circuit, and simultaneously, effectively reduces the leakage current generated by the second initialization module 5 in the light emitting stage, improves the problem of the leakage current of the first electrode a1 of the organic light emitting structure a, improves the stability of the voltage of the first electrode a1 of the organic light emitting structure a, and further optimizes the display effect of the display device.
Fig. 10 is a driving timing diagram of the pixel driving circuit having the structure shown in fig. 4. A specific connection relationship between the transistors can be set as shown in fig. 4, and the operation principle of the pixel driving circuit will be described in detail with reference to fig. 4 and 10:
fig. 10 is a driving timing diagram of a pixel driving circuit having the structure shown in fig. 4 according to an embodiment of the invention. Unlike fig. 2, the first initialization transistor T4 may be an N-type thin film transistor, i.e., an oxide thin film transistor, and the connection type of the remaining transistors is the same as that of fig. 2, and the following description will specifically explain the operation principle of the pixel driving circuit having the structure shown in fig. 4 with reference to fig. 10:
in the T1 (initialization) period, the first and second initialization transistors T4 and T7 are connected between the first and second poles b2 and b3, respectively, and the first and second poles b2 and b3 of the remaining transistors are turned off.
In this case, the reference signal Vref is transmitted to the gate b1 of the driving transistor T1 through the first initializing transistor T4, and the driving transistor T1 is initialized by the reference signal. Likewise, the reference signal Vref is transmitted to the first electrode a1 of the organic light emitting structure a through the second initializing transistor T7, and the first electrode a1 of the organic light emitting structure a is initialized by the reference signal.
In the T2 (data writing) period, the first pole b2 and the second pole b3 of each of the second initialization transistor T7, the threshold compensation transistor T3, the data writing transistor T2 and the driving transistor T1 are connected, and the first pole b2 and the second pole b3 of the remaining transistors are disconnected. The specific data writing process is similar to that of the pixel driving circuit with the structure shown in fig. 2, and thus, the detailed description is omitted.
The first initialization module 4 formed by the oxide thin film transistor T4 is turned off, so that the normal driving function of the pixel driving circuit is realized, the leakage current generated by the first initialization module 4 in the data writing stage is effectively reduced, the problem of leakage current at the control end a1 of the driving module 1 is solved, the voltage stability of the control end a1 of the driving module 1 is improved, and the display effect of the display device is optimized.
In the T3 (light emitting) period, the first and second electrodes b2 and b3 of the first, second and driving transistors T5, T6 and T1 are connected, and the first electrodes b2 and b3 of the remaining transistors are disconnected. The specific light emitting process is similar to that of the pixel driving circuit with the structure shown in fig. 2, and thus, the detailed description is omitted.
The turn-off of the first initialization module 4 formed by the oxide thin film transistor T4 is beneficial to realizing the normal driving function of the pixel driving circuit, and simultaneously, the leakage current generated by the first initialization module 4 in the data writing stage is effectively reduced, the problem of the leakage current of the control end a1 of the driving module 1 is improved, the stability of the voltage of the control end a1 of the driving module 1 is improved, and the turn-off of the second initialization module 5 formed by the oxide thin film transistor T7 is beneficial to realizing the normal driving function of the pixel driving circuit, and simultaneously, the leakage current generated by the second initialization module 5 in the light emitting stage is effectively reduced, the problem of the leakage current of the first electrode a1 of the organic light emitting structure a is improved, the stability of the voltage of the first electrode a1 of the organic light emitting structure a is improved, and the display effect of the display device is further optimized.
Fig. 11 is a driving timing diagram of the pixel driving circuit with the structure shown in fig. 6, and since the inversion module 6 is added in fig. 6 relative to fig. 4, the high and low levels in the driving timing of S3 and the high and low levels in the driving timing of S2 are set to be reversed, and the specific operation principle of the pixel driving circuit is similar to that in fig. 4, and is not repeated here.
Fig. 11 may also be a driving timing diagram of the pixel driving circuit having the structure shown in fig. 8, in combination with fig. 8 and 11, and in combination with fig. 8 and 11, the only difference from the operation principle of the pixel driving circuit shown in fig. 6 is that the second initialization block 5, i.e., the second initialization transistor T7, is turned off at the stage T2, i.e., the data writing stage.
It should be noted that the high level and the low level mentioned in the above embodiments are relative concepts, and the size of the specific level value included in the high level and the low level is not limited in the embodiments of the present invention. In addition, in the embodiment of the present invention, the number of transistors and the number of capacitor elements in the pixel driving circuit are not specifically limited, and the number of transistors and the number of capacitor elements in the pixel driving circuit may be selected according to specific requirements.
The pixel driving circuit provided by the embodiment of the invention comprises a driving module, a data writing module, a storage module and a first initialization module, wherein the driving module is used for providing driving current for an organic light-emitting structure, the organic light-emitting structure responds to the driving current to emit light, the data writing module is used for writing a data signal into a control end of the driving module in a data writing stage, the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage, the first initialization module is used for initializing the potential of the control end of the driving module in the initialization stage, a thin film transistor forming the first initialization module is an oxide thin film transistor, at least one oxide transistor is a thin film transistor with a multi-gate structure, the normal driving function of the pixel driving circuit is realized, and meanwhile, the first initialization module formed by the oxide thin film transistor effectively reduces the leakage current generated by the first initialization module in the data writing stage and the light-emitting stage, the problem of the control end electric leakage of the driving module is solved, the stability of the control end voltage of the driving module is improved, and the display effect of the display device is optimized.
Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 12, the display device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiments, which are not repeated herein. Illustratively, the display device may be an organic light emitting display device, the display device may further include a plurality of scan signal lines D12, a plurality of data signal lines D13, a gate driving module D121, a source driving module D131, a driving control module D101, and a power supply module D102, the pixel driving circuit D1 is disposed in a space formed by the scan signal lines D12 and the data signal lines D13 crossing each other, the gate driving module D121 inputs a scan signal to the corresponding pixel driving circuit through the scan signal line D12 in response to a scan driving control signal generated by the driving control module D101, the pixel driving circuit D1 communicates with the data signal lines D13 electrically connected thereto in response to a scan signal input from the scan signal lines D12 electrically connected thereto, the source driving circuit D131 inputs a data signal to the corresponding pixel driving circuit D1 through the data signal lines D13 in response to a data driving control signal generated by the driving control module D101, the power supply module 102 provides the first power signal VDD and the second power signal VSS to the pixel driving circuit, and the display device accordingly achieves the display function. For example, the display device may be an organic light emitting display panel, the display device may also be a mobile phone, as shown in fig. 13, or may be an electronic device such as a computer or a wearable device, and the specific form of the display device is not limited in the embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. A pixel driving circuit, comprising:
a driving module for supplying a driving current to an organic light emitting structure, the organic light emitting structure emitting light in response to the driving current;
the data writing module is used for writing a data signal into the control end of the driving module in a data writing stage;
the storage module is used for maintaining the potential of the control end of the driving module in a light-emitting stage;
the first initialization module is used for initializing the potential of the control end of the driving module in an initialization stage; the thin film transistors forming the first initialization module are oxide thin film transistors, and at least one oxide thin film transistor is a thin film transistor with a multi-gate structure;
the first initialization module comprises a first initialization sub-module and a second initialization sub-module, a first end of the first initialization sub-module is electrically connected with a first end of the second initialization sub-module, and a second end of the first initialization sub-module is electrically connected with a control end of the driving module; at least one of the first and second initialization sub-modules is turned off in the data writing phase and the light emitting phase; the thin film transistors forming the first initialization submodule and the second initialization submodule are oxide thin film transistors;
the control end of the first initialization submodule is electrically connected with the control end of the data writing module and is accessed into a first scanning signal; the control end of the second initialization submodule is electrically connected with the control end of the second initialization module and is connected with an enabling signal, the second end of the second initialization submodule is connected with a reference signal, and the thin film transistor of the data writing module is a low-temperature polycrystalline silicon thin film transistor;
the first initialization submodule and the second initialization submodule are conducted in an initialization stage and are conducted alternately in a data writing stage and a light emitting stage.
2. The pixel driving circuit according to claim 1, further comprising:
a second initialization module for initializing a potential of the first electrode of the organic light emitting structure in the initialization stage; the thin film transistor forming the second initialization module is an oxide thin film transistor with a multi-gate structure.
3. The pixel driving circuit according to claim 1, wherein the thin film transistor constituting the data writing module is a P-type thin film transistor.
4. The pixel driving circuit according to any one of claims 2 to 3, further comprising:
at least one light emission control module for controlling the organic light emitting structure not to emit light before the light emission phase;
the control end of the second initialization module is electrically connected with the control end of the light-emitting control module; wherein, the thin film transistor forming the light emitting control module is a P-type thin film transistor.
5. A display device comprising the pixel drive circuit according to any one of claims 1 to 4.
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| CN110277060B (en) * | 2019-05-21 | 2021-11-16 | 合肥维信诺科技有限公司 | Pixel circuit and display device |
| CN111627388B (en) * | 2020-06-28 | 2022-01-14 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN111724744A (en) * | 2020-07-14 | 2020-09-29 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display device |
| CN111754920A (en) * | 2020-07-17 | 2020-10-09 | 武汉华星光电半导体显示技术有限公司 | Pixel driving circuit, driving method thereof and display panel |
| CN111739471B (en) | 2020-08-06 | 2022-02-22 | 武汉天马微电子有限公司 | Display panel, driving method and display device |
| CN112053661B (en) * | 2020-09-28 | 2023-04-11 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method, display panel and display device |
| CN113539184B (en) * | 2021-07-20 | 2022-10-28 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof and display panel |
| CN116795452B (en) * | 2023-07-20 | 2024-04-02 | 龙芯中科(北京)信息技术有限公司 | Method, device and equipment for determining compatibility of driving program |
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