CN110599964A - Pixel driving circuit and display device - Google Patents
Pixel driving circuit and display device Download PDFInfo
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- CN110599964A CN110599964A CN201910562865.XA CN201910562865A CN110599964A CN 110599964 A CN110599964 A CN 110599964A CN 201910562865 A CN201910562865 A CN 201910562865A CN 110599964 A CN110599964 A CN 110599964A
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- 239000010409 thin film Substances 0.000 claims abstract description 75
- 230000004044 response Effects 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 15
- 239000003990 capacitor Substances 0.000 description 12
- 230000006870 function Effects 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The invention discloses a pixel driving circuit and a display device, wherein the pixel driving circuit comprises a driving module, a threshold compensation module, a data writing module and a storage module; the driving module provides a driving current to the organic light-emitting structure, the organic light-emitting structure emits light in response to the driving current, and the driving module comprises a driving transistor; the threshold compensation module grabs the threshold voltage of the driving transistor to the control end of the driving module in the threshold grabbing stage; the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure; the data writing module writes a data signal into the first end of the storage module in the threshold capturing stage, and the storage module maintains the electric potential of the control end of the driving module in the light-emitting stage and couples the data signal of the first end to the control end of the driving module in the data writing stage. By the technical scheme of the invention, the problem of unstable control end potential of the driving module is solved while the normal driving function of the pixel driving circuit is realized.
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 unstable electric potential, 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 can reduce the power consumption of the display device and 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:
the device comprises a driving module, a threshold compensation module, a data writing module and a storage module;
the driving module is used for providing a driving current for the organic light-emitting structure, the organic light-emitting structure emits light in response to the driving current, and the driving module comprises a driving transistor;
the threshold compensation module is used for grabbing the threshold voltage of the driving transistor to the control end of the driving module in a threshold grabbing stage; the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure;
the data writing module is used for writing a data signal into a first end of the storage module in the threshold capture stage, the storage module is used for maintaining the potential of a control end of the driving module in a light-emitting stage, and the storage module is used for coupling the data signal of the first end to the control end of the driving module in the data writing stage.
Further, the pixel driving circuit further includes:
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 transistor forming the first initialization module is an oxide 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 an initialization stage; the thin film transistor forming the second initialization module is an oxide thin film transistor with a multi-gate structure.
Furthermore, the pixel driving circuit further comprises a first initialization module and a second initialization module, the first initialization module and the second initialization module are electrically connected with a reference signal line, the data writing module is electrically connected with a data signal line, and the reference signal line and the data signal line share the same signal line.
Further, the same signal line is used for transmitting a reference signal in an initialization phase and the data writing phase, and transmitting the data signal in the threshold grabbing phase.
Further, the second end of the data writing module is electrically connected with the first end of the storage module.
Further, the threshold compensation module is further configured to capture the first power signal to the control end of the driving module in the threshold capture stage.
Furthermore, the control end of the driving module is electrically connected to the second end of the storage module, the first end of the driving module is connected to the first power signal, and the second end of the driving module is electrically connected to the threshold compensation module.
Further, the pixel driving circuit further includes:
a light emission control module for controlling the organic light emitting structure not to emit light before the light emission phase;
the first end of the light-emitting control module is electrically connected with the second end of the driving module, and the second end of the light-emitting control module is electrically connected with the first electrode of the organic light-emitting structure.
In a second aspect, embodiments of the present invention further provide a display device, which includes the pixel driving circuit according to the first aspect.
The embodiment of the invention provides a pixel driving circuit and a display device, the pixel driving circuit comprises a driving module, a threshold compensation module, a data writing module and a storage module, the threshold compensation module grabs the threshold voltage of a driving transistor to the control end of the driving module in the threshold grabbing stage, the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure, the data writing module writes a data signal into the first end of the storage module in the threshold grabbing stage, the storage module maintains the potential of the control end of the driving module in the light-emitting stage and couples the data signal of the first end to the control end of the driving module in the data writing stage, the normal driving function of the pixel driving circuit is realized, the problem of unstable potential of the control end of the driving module is improved, the power consumption of the display device is reduced, and the stability of the voltage of the control end of the driving module is improved, thereby optimizing 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 driving timing diagram of the pixel driving circuit with the structure shown in FIG. 2;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 5 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 threshold compensation module, a data writing module and a storage 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, and the driving module comprises a driving transistor. The threshold compensation module is used for capturing the threshold voltage of the driving transistor to the control end of the driving module in the threshold capturing stage; the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure. The data writing module is used for writing a data signal into the first end of the storage module in a threshold capturing stage, and the storage module is used for maintaining the electric potential of the control end of the driving module in a light-emitting stage and coupling the data signal of the first end to the control end of the driving module in a data writing stage.
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 magnitude of 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, a transistor electrically connected with a gate of a driving transistor has a problem of electric leakage, the larger the leakage current is, the shorter the time for the driving transistor to maintain a gate potential is, the larger the driving frequency of a corresponding driving IC is, so that the power consumption of the driving IC is higher, and further, the power consumption of a display device is higher. In addition, the gate potential of the driving transistor is unstable due to the leakage current, and thus the on-off state of the driving transistor is unstable, and the light emitting time of the organic light emitting structure is also unstable, which affects the display effect of the display device.
The pixel driving circuit provided by the embodiment of the invention comprises a driving module, a threshold compensation module, a data writing module and a storage 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, and the driving module comprises a driving transistor. The threshold compensation module is used for capturing the threshold voltage of the driving transistor to the control end of the driving module in the threshold capturing stage; the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure. The data writing module is used for writing a data signal into the first end of the storage module in a threshold capturing stage, the storage module is used for maintaining the electric potential of the control end of the driving module in a light-emitting stage and coupling the data signal of the first end to the control end of the driving module in the data writing stage, the normal driving function of the pixel driving circuit is realized, meanwhile, the threshold compensation module formed by the oxide thin film transistor with the multi-gate structure effectively reduces the leakage current generated by the threshold compensation module in the data writing stage and the light-emitting stage, the problem that the electric potential of the control end of the driving module is unstable is solved, the power consumption of the display device is reduced, the stability of the voltage of the control end 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. With reference to fig. 1 and 2, the pixel driving circuit includes a driving module 1, a threshold compensation module 2, a data writing module 3, and a storage module 4, the driving module 1 is configured to provide a driving current Id to the organic light emitting structure 5, the organic light emitting structure 5 emits light in response to the driving current Id, and the driving module 1 includes a driving transistor T1. The threshold compensation module 2 is configured to capture a threshold voltage of the driving transistor T1 to the control terminal a1 of the driving module 1 at a threshold capture stage, and the thin film transistor constituting the threshold compensation module 2 is an oxide thin film transistor with a multi-gate structure. The data writing module 3 is used for writing the data signal into the first terminal d1 of the memory module 4 during the threshold capture phase, and the memory module 4 is used for maintaining the voltage level of the control terminal a1 of the driving module 1 during the light-emitting phase and coupling the data signal of the first terminal d1 of the memory module 4 to the control terminal a1 of the driving module 1 during the data writing phase.
Specifically, with reference to fig. 1 and fig. 2, the threshold compensation module 2 captures the threshold voltage of the driving transistor T1 to the control terminal a1 of the driving module 1 in the threshold capture phase, which is beneficial to make the driving current Id flowing through the organic light emitting structure 5 independent of the threshold voltage Vth of the driving transistor T1 in 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. In addition, after the pixel driving circuit enters the data writing stage and the light emitting stage, the threshold compensation module 2 is turned off, the leakage current generated by the threshold compensation module 2 directly affects the stability of the potential of the control terminal a1 of the driving module 1, the thin film transistor constituting the threshold compensation module 2 is set to be an oxide thin film transistor, for example, the channel material of the thin film transistor constituting the threshold compensation module 2 can be set to be IGZO (indium gallium zinc oxide), the leakage current generated by the oxide thin film transistor when turned off is smaller, for example, the leakage current generated when turned off is smaller compared with the LTPS (low temperature polysilicon) thin film transistor commonly used at present, so that the leakage current generated by the threshold compensation module 2 at the data writing stage and the light emitting stage is effectively reduced by using the oxide thin film transistor to constitute the threshold compensation module 2 while the normal driving function of the pixel driving circuit is realized, the problem of unstable potential of the control end a1 of the driving module 1 is solved, the power consumption of the display device is reduced, 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 further optimized.
In addition, the LTPS thin film transistor relates to a process of converting amorphous silicon into polycrystalline silicon in the manufacturing process, the uniformity of channel materials is poor, the switching characteristic of the LTPS thin film transistor is influenced, the uniformity of communication materials of the oxide thin film transistor is good, and the thin film transistor forming the threshold compensation module 2 is arranged to be the oxide thin film transistor, so that the switching characteristic of the threshold compensation module 2 is optimized, and the display effect of the display device is further optimized. In addition, the oxide transistor constituting the threshold compensation module 2 may be configured as a thin film transistor with a multi-gate structure, and the thin film transistor constituting the threshold compensation module 2 is exemplarily configured as an oxide thin film transistor with a double-gate structure but is not limited to the oxide thin film transistor with the double-gate structure, which is beneficial to further reducing the leakage current generated by the threshold compensation module 2 when the thin film transistor is turned off, reducing the power consumption of the display device, 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 with the thin film transistor with a single-gate structure.
Alternatively, in conjunction with fig. 1 and fig. 2, the pixel driving circuit may further include a first initialization module 6, where the first initialization module 6 is configured to initialize the potential of the control terminal a1 of the driving module 1 in an initialization stage, the thin film transistor constituting the first initialization module 6 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 first initialization module 6 as an oxide thin film transistor with a double-gate structure, but is not limited to the oxide thin film transistor with the double-gate structure.
Specifically, with reference to fig. 1 and fig. 2, the first initialization module 6 initializes the potential of the control terminal a1 of the driving module 1 in an initialization phase, after the pixel driving circuit enters the threshold capture phase, the data writing phase and the light emitting phase, the first initialization module 6 is turned off, and the leakage current generated by the first initialization module 6 directly 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 6 is an oxide thin film transistor, for example, a channel material of the thin film transistor forming the first initialization module 6 may be IGZO (indium gallium zinc oxide), and a leakage current generated when the oxide thin film transistor is turned off is small, so that, while the normal driving function of the pixel driving circuit is realized, the leakage current generated by the first initialization module 6 in the threshold capture stage, the data writing stage and the light emitting stage is effectively reduced by forming the first initialization module 6 with the oxide thin film transistor, the problem of unstable potential at the control end a1 of the driving module 1 is solved, the power consumption of the display device is reduced, the stability of the voltage at the control end a1 of the driving module 1 is improved, and the display effect of the display device is further optimized.
Similarly, the uniformity of the communication material of the oxide thin film transistor is good, and the thin film transistor constituting the first initialization module 6 is set to be the oxide thin film transistor, which is beneficial to optimizing the switching characteristic of the first initialization module 6, and further optimizing the display effect of the display device. In addition, the oxide transistor constituting the first initialization module 6 may be a thin film transistor with a multi-gate structure, which is beneficial to further reducing the leakage current generated when the first initialization module 6 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.
Optionally, in conjunction with fig. 1 and fig. 2, the pixel driving circuit may further include a second initialization module 7, where the second initialization module 7 is configured to initialize the potential of the first electrode 51 of the organic light emitting structure 5 in an initialization phase, the thin film transistor constituting the second initialization module 7 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 7 as an oxide thin film transistor with a double-gate structure, but is not limited to the oxide thin film transistor with the double-gate structure.
Specifically, with reference to fig. 1 and fig. 2, the second initialization module 7 initializes the potential of the first electrode 51 of the organic light emitting structure 5 in the initialization stage, after the pixel driving circuit enters the light emitting stage, the second initialization module 7 is turned off, the leakage current generated by the second initialization module 7 directly affects the stability of the potential of the first electrode of the organic light emitting structure 5, the thin film transistor constituting the second initialization module 7 is set to be an oxide thin film transistor, for example, the channel material of the thin film transistor constituting the second initialization module 7 may be IGZO, and the leakage current generated when the oxide thin film transistor is turned off is small, so that the normal driving function of the pixel driving circuit is realized, and the leakage current generated by the second initialization module 7 in the light emitting stage is effectively reduced by using the oxide thin film transistor to constitute the second initialization module 7, the problem of unstable electric potential of the first electrode 51 of the organic light-emitting structure 5 in the light-emitting stage is solved, the stability of the voltage of the first electrode 51 of the organic light-emitting structure 5 is improved, and the display effect of the display device is further optimized.
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 7 is set to be the oxide thin film transistor, which is beneficial to optimizing the switching characteristic of the second initialization module 7, and further optimizing the display effect of the display device. In addition, the thin film transistor forming the second initialization module 7 is an oxide thin film transistor with a multi-gate structure, which is beneficial to further reducing the leakage current generated when the second initialization module 7 is turned off, improving the stability of the voltage of the first electrode 51 of the organic light emitting structure 5, and optimizing the display effect of the display device.
Alternatively, as shown in fig. 1 and fig. 2, the first initialization module 6 and the second initialization module 7 may be both electrically connected to a reference signal line r, the data writing module 3 is electrically connected to a data signal line d, and the reference signal line r and the data signal line d share the same signal line. Specifically, with reference to fig. 1 and fig. 2, the data signal line d electrically connected to the data writing module 3 and the reference signal line r electrically connected to the first initializing module 6 and the second initializing module 7 share the same signal line, and the signal line may be configured to output the data signal and the reference signal in a time-sharing manner to ensure that the pixel driving circuit completes a normal pixel driving function, for example, the signal line may be configured to transmit the reference signal in the initializing stage and the data writing stage and transmit the data signal in the threshold capturing stage, so that the normal driving function of the pixel driving circuit is realized, and at the same time, the number of signal lines electrically connected to the pixel driving circuit is reduced, which is favorable for realizing a narrow bezel of the display device.
Alternatively, in conjunction with fig. 1 and 2, the second end a3 of the data write module 3 may be electrically connected with the first end d1 of the memory module 4. Specifically, with reference to fig. 1 and fig. 2, the second end a3 of the data writing module 3 is electrically connected to the first end a2 of the storage module 4, in the threshold capture phase, the first end a2 of the data writing module 3 accesses the data signal, and the data writing module 3 writes the data signal into the first end d1 of the storage module 4, which is beneficial to coupling the data signal of the first end d1 of the storage module 4 to the control end a1 of the driving module 1 in the data writing phase, so that the driving current generated by the driving module 1 can be adjusted by adjusting the size of the data signal, and further the light-emitting brightness of the organic light-emitting structure 5 is adjusted, and the display device achieves the display function.
Optionally, in conjunction with fig. 1 and fig. 2, the threshold compensation module 2 is further configured to capture the first power signal VDD to the control terminal a1 of the driving module 1 during the threshold capture phase. Specifically, with reference to fig. 1 and fig. 2, the threshold compensation module 2 can capture the first power signal VDD to the control terminal a1 of the driving module 1 in the threshold capture stage, which is beneficial to make the driving circuit finally generated by the driving module 1 independent of the first power signal VDD, so as to improve the problem of poor display uniformity of the display device caused by the influence of the voltage drop of the first power signal VDD on the signal line on the driving current generated by the driving module 1, and improve the display uniformity of the display device.
Alternatively, in combination with fig. 1 and fig. 2, the control terminal a1 of the driving module 1 may be electrically connected to the second terminal d2 of the memory module 4, the first terminal a2 of the driving module 1 is connected to the first power signal VDD, and the second terminal a3 of the driving module 1 is electrically connected to the threshold compensation module 2. Specifically, the control terminal a1 of the driving module 1 is electrically connected to the second terminal d2 of the memory module 4, so that the control terminal a1 of the driving module 1 can receive the data signal coupled to the second terminal a3 of the memory module 4 in the data writing phase, the second terminal a3 of the driving module 1 is electrically connected to the threshold compensation module 2, so that the threshold compensation module 2 can capture the first power signal VDD to the control terminal a1 of the driving module 1 in the threshold capture phase, the first terminal a2 of the driving module 1 is connected to the first power signal VDD, and further the driving circuit finally generated by the driving module 1 is independent of the first power signal VDD, thereby improving the problem of poor display uniformity of the display device caused by the voltage drop of the first power signal VDD on the signal line affecting the driving current generated by the driving module 1, and improving the display uniformity of the display device.
Optionally, with reference to fig. 1 and fig. 2, the pixel driving circuit may further include a light emission control module 8, where the light emission control module 8 is configured to control the organic light emitting structure 5 not to emit light before the light emission phase, and a first end a2 of the light emission control module 8 may be electrically connected to a second end a3 of the driving module 1, a second end a3 of the light emission control module 8 is electrically connected to the first electrode 51 of the organic light emitting structure 5, and the second electrode 52 of the organic light emitting structure 5 is connected to the second power signal VSS. Specifically, with reference to fig. 1 and fig. 2, the light-emitting control module 8 controls the organic light-emitting structure 5 not to emit light before the light-emitting stage, that is, in the initialization stage, the threshold capture stage and the data writing stage, the light-emitting control module 8 is in the off state, so that the driving module 1 to the organic light-emitting structure 5 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 5, and the organic light-emitting structure 5 does not emit light, thereby effectively avoiding the problem of light leakage of the organic light-emitting structure 5 in the non-light-emitting stage.
Fig. 3 is a driving timing diagram of the pixel driving circuit having the structure shown in fig. 2. For example, the driving module 1 may include a driving transistor T1, the threshold compensation module 2 includes a threshold compensation transistor T2, the data writing module 3 includes a data writing transistor T3, the first initialization module 6 includes a first initialization transistor T6, the second initialization module 7 includes a second initialization transistor T7, the light-emitting control module 8 includes a light-emitting control transistor T8, the memory module 4 includes a storage capacitor C1, and the threshold compensation transistor T2, the first initialization transistor T6, and the second initialization transistor T7 are all multi-gate structures, such as but not limited to an oxide thin film transistor with a double-gate structure, i.e., an N-type thin film transistor, and the rest of the transistors are all P-type thin film transistors, e.g., all LTPS thin film transistors. The following will specifically explain the operation principle of the pixel driving circuit having the structure shown in fig. 2 with reference to fig. 3:
in the T1 (initialization) period, the first and second initialization transistors T6 and T7 have their respective first and second poles b2 and b3 connected to each other, and the remaining transistors have their first and second poles b2 and b3 disconnected from each other.
In this case, the control terminal a1 writes the reference signal REF, the reference signal is transmitted to the gate b1 of the driving transistor T1 through the first initializing transistor T6, the gate of the driving transistor T1, i.e., the second node N2, is initialized by the reference signal, the potential of the second node N2 is equal to the level value Vref of the reference signal, the reference signal is transmitted to the first electrode 51 of the organic light emitting structure 5 through the second initializing transistor T7, and the first electrode 51 of the organic light emitting structure 5 is initialized by the reference signal.
In the T2 (threshold grabbing) period, the threshold compensation transistor T2 and the data writing transistor T3 are connected between the corresponding first pole b2 and second pole b3, and since the reference signal is written to the gate of the driving transistor T1 in the previous period, i.e., the second node N2, the first pole b2 and second pole b3 of the driving transistor T1 are connected, and the first poles b2 and second poles b3 of the remaining transistors are turned off.
In this case, the control terminal a1 writes the DATA signal DATA, the first terminal e1 of the storage capacitor C1, i.e., the first node N1, writes the DATA signal, the potential of the N1 node is the level value Vdata of the DATA signal, the driving transistor T1 is equivalent to a diode and forward biased through the threshold compensation transistor T2, the first power signal VDD and the threshold voltage of the driving transistor T1 are written to the gate b1 of the driving transistor T1 through the threshold compensation transistor T2, a writing path is the path L1 in fig. 2, the gate b1 of the driving transistor T1, i.e., the potential of the second node N2 is equal to the sum of the level value VDD of the first power signal VDD and the absolute value | Vth | of the threshold voltage Vth | of the driving transistor T1, i.e., in the threshold grasping phase, the threshold compensation module 2 grasps the threshold voltage of the first power signal VDD and the threshold voltage of the driving transistor T1 to the gate b1 of the driving transistor T1.
In the T3 (data write) period, the data write transistor T3 and the driving transistor T1 are connected between the corresponding first pole b2 and second pole b3, and the remaining transistors are disconnected between the first pole b2 and second pole b 3.
In this case, the control terminal a1 writes the reference signal REF, the first terminal e1 of the storage capacitor, that is, the potential of the first node N1 becomes the level value Vref of the reference signal, the first node N1 changes the potential thereof from the T2 period to the T1 period to a value of a difference between the level value Vdata of the data signal and the level value Vref of the reference signal, and due to the coupling effect of the storage capacitor, the gate of the driving transistor T1, that is, the potential of the second node N2 becomes Vdd + | Vth | + Vdata-Vref, that is, in the data writing phase, the storage capacitor couples the data signal of the first terminal a2 to the gate of the driving transistor T1.
In the T4 (light emitting) period, the light emission control transistor T8 and the driving transistor T1 are connected between the corresponding first pole b2 and second pole b3, and the remaining transistors are disconnected between the first pole b2 and second pole b 3.
In this case, the first power signal VDD is transmitted to the first pole b2 of the driving transistor T1, and a voltage difference between the level value of the second node N2 and the level value VDD of the first power signal VDD is equal to a difference of VDD + | Vth | + Vdata-Vref and VDD, and is equal to | Vth | + Vdata-Vref, which is a voltage difference Vgs between the gate b1 and the source (the first pole b2) of the driving transistor T1.
The storage capacitor C1 is electrically connected to the gate b1 of the driving transistor T1, and the storage capacitor C1 is capable of maintaining the voltage of the gate b1 of the driving transistor T1 in a light emission phase, i.e., a period of T4, and the voltage Vgs between the gate b1 and the source (first pole b2) of the driving transistor T1 is held or substantially held by the storage capacitor C1 by | Vth | + Vdata-Vref, and the driving current Id of the driving transistor T1 and the voltage Vgs between the gate b1 and the source (first pole b2) are squared by the threshold voltage Vth of the driving transistor T1, i.e., (Vdata-Vref) 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 b2)2In proportion, the driving current Id of the driving transistor T1 is independent of the threshold voltage Vth of the driving transistor T1, so that the driving current Id flowing through the organic light emitting structure 5 in the light emitting phase is independent of the threshold voltage Vth of the driving transistor T1, and the problem of display unevenness caused by the shift of the threshold voltage Vth of the driving transistor T1 is effectively avoided. In addition, the driving current finally generated by the driving transistor T1 is not related to the first power signal VDD, so that the problem of poor display uniformity of the display device caused by the influence of the voltage drop of the first power signal VDD on the signal line on the driving current generated by the driving transistor T1 is solved, and the further improvement of the display uniformity of the display device is realizedDisplay uniformity of the display device.
After the pixel driving circuit enters a data writing stage and a light emitting stage, the threshold compensation transistor T2 is turned off, the leakage current generated by the threshold compensation transistor T2 directly affects the stability of the potential of the gate of the driving transistor T1, after the pixel driving circuit enters a threshold grabbing stage, a data writing stage and a light emitting stage, the first initialization transistor T6 is turned off, the leakage current generated by the first initialization transistor T6 directly affects the stability of the potential of the gate of the driving transistor T1, the threshold compensation transistor T2 and the first initialization transistor T6 are both oxide thin film transistors with a multi-gate structure, the normal driving function of the pixel driving circuit is realized, meanwhile, the problem of unstable potential of the control terminal a1 of the driving module 1 is effectively improved by using the oxide thin film transistors with the multi-gate structure, the power consumption of the display device is reduced, and the stability of the voltage of the control terminal a1 of the driving module 1 is improved, thereby optimizing the display effect of the display device. In addition, the gate leakage of the driving transistor T1 is reduced, which is favorable for reducing the capacitance of the storage capacitor C1, and further reducing the area of the storage capacitor C1, and is favorable for improving the resolution of the display device.
For example, in fig. 2, the driving transistor T1, the data writing transistor T3, and the light emission controlling transistor T8 are illustrated as P-type transistors, the driving transistor T1, the data writing transistor T3, and the light emission controlling transistor T8 may be N-type transistors, the N-type driving transistor T1, the data writing transistor T3, and the light emission controlling transistor T8 may be LTPS transistors, and the driving timings corresponding to the N-type driving transistor T1, the data writing transistor T3, and the light emission controlling transistor T8 may be inverted in level among the driving timings corresponding to the P-type transistors.
It should be noted that, 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.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 4, 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 device, the display device may be a mobile phone as shown in fig. 5, 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 (10)
1. A pixel driving circuit, comprising:
the device comprises a driving module, a threshold compensation module, a data writing module and a storage module;
the driving module is used for providing a driving current for the organic light-emitting structure, the organic light-emitting structure emits light in response to the driving current, and the driving module comprises a driving transistor;
the threshold compensation module is used for grabbing the threshold voltage of the driving transistor to the control end of the driving module in a threshold grabbing stage; the thin film transistor forming the threshold compensation module is an oxide thin film transistor with a multi-gate structure;
the data writing module is used for writing a data signal into a first end of the storage module in the threshold capture stage, the storage module is used for maintaining the potential of a control end of the driving module in a light-emitting stage, and the storage module is used for coupling the data signal of the first end to the control end of the driving module in the data writing stage.
2. The pixel driving circuit according to claim 1, further comprising:
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 transistor forming the first initialization module is an oxide thin film transistor with a multi-gate structure.
3. 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 an initialization stage; the thin film transistor forming the second initialization module is an oxide thin film transistor with a multi-gate structure.
4. The pixel driving circuit according to any one of claims 1 to 3, further comprising a first initialization module and a second initialization module, wherein the first initialization module and the second initialization module are both electrically connected to a reference signal line, the data writing module is electrically connected to a data signal line, and the reference signal line and the data signal line share a same signal line.
5. The pixel driving circuit according to claim 4, wherein the same signal line is used for transmitting a reference signal in an initialization phase and the data writing phase, and for transmitting the data signal in the threshold grabbing phase.
6. The pixel driving circuit according to any of claims 1-3, wherein the second terminal of the data writing module is electrically connected to the first terminal of the memory module.
7. The pixel driving circuit according to any of claims 1-3, wherein the threshold compensation module is further configured to capture the first power signal to the control terminal of the driving module during the threshold capture phase.
8. The pixel driving circuit according to claim 7, wherein the control terminal of the driving module is electrically connected to the second terminal of the storage module, the first terminal of the driving module is connected to the first power signal, and the second terminal of the driving module is electrically connected to the threshold compensation module.
9. The pixel driving circuit according to any one of claims 1 to 3, further comprising:
a light emission control module for controlling the organic light emitting structure not to emit light before the light emission phase;
the first end of the light-emitting control module is electrically connected with the second end of the driving module, and the second end of the light-emitting control module is electrically connected with the first electrode of the organic light-emitting structure.
10. A display device comprising the pixel drive circuit according to any one of claims 1 to 9.
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Application publication date: 20191220 |