CN110751927A - Pixel driving circuit, driving method thereof, display panel and display device - Google Patents

Pixel driving circuit, driving method thereof, display panel and display device Download PDF

Info

Publication number
CN110751927A
CN110751927A CN201911056337.3A CN201911056337A CN110751927A CN 110751927 A CN110751927 A CN 110751927A CN 201911056337 A CN201911056337 A CN 201911056337A CN 110751927 A CN110751927 A CN 110751927A
Authority
CN
China
Prior art keywords
transistor
node
electrically connected
unit
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911056337.3A
Other languages
Chinese (zh)
Other versions
CN110751927B (en
Inventor
欧阳珺婷
席克瑞
林柏全
孔祥梓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Tianma Microelectronics Co Ltd
Original Assignee
Shanghai Tianma AM OLED Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Tianma AM OLED Co Ltd filed Critical Shanghai Tianma AM OLED Co Ltd
Priority to CN201911056337.3A priority Critical patent/CN110751927B/en
Publication of CN110751927A publication Critical patent/CN110751927A/en
Application granted granted Critical
Publication of CN110751927B publication Critical patent/CN110751927B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the invention discloses a pixel driving circuit and a driving method thereof, a display panel and a display device, wherein the pixel driving circuit comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a voltage stabilizing unit, a storage capacitor, a driving transistor and a light-emitting element; the initialization unit is electrically connected between the initialization signal end and the first node; the data writing unit is electrically connected between the data signal end and the first electrode of the driving transistor; the grid of the driving transistor and the first end of the storage capacitor are electrically connected to the second node; the second end of the storage capacitor is electrically connected with the power signal end; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the second node; the voltage stabilizing unit is electrically connected between the first node and the second node; the light-emitting control unit is electrically connected between the power signal terminal and the light-emitting element. The technical method provided by the embodiment of the invention can solve the problem of uneven display caused by electric leakage, thereby improving the display effect.

Description

Pixel driving circuit, driving method thereof, display panel and display device
Technical Field
The invention relates to the technical field of driving, in particular to a pixel driving circuit, a driving method thereof, a display panel and a display device.
Background
An Organic Light Emitting Diode (OLED) display has the advantages of self-luminescence, low driving voltage, high Light Emitting efficiency, short response time, and flexible display, and is the most promising display currently.
The OLED element of the OLED display is a current-driven type element, and a corresponding pixel driving circuit needs to be provided to supply a driving current to the OLED element so that the OLED element can emit light. A pixel driving circuit of an OLED display generally includes a driving transistor capable of generating a driving current for driving an OLED element according to a voltage of a gate thereof, a switching transistor, and a storage capacitor. However, due to the process and the aging of the device, the threshold voltage of the driving transistor in the pixel driving circuit is shifted, which causes display non-uniformity. In the prior art, a threshold compensation circuit is arranged in a pixel driving circuit to drive the threshold voltage of a transistor so as to solve the problem of uneven display caused by threshold voltage drift.
However, in the conventional pixel driving circuit with the threshold compensation function, due to the characteristics of the transistor, a small current still flows through the transistor when the transistor is turned off, so that the gate voltage of the driving transistor changes, the luminance of the light emitting element is affected, and the display effect is affected due to the phenomenon of display unevenness.
Disclosure of Invention
Embodiments of the present invention provide a pixel driving circuit, a driving method thereof, a display panel and a display device, so as to solve the technical problems in the prior art that the gate voltage of a driving transistor changes due to the influence of a leakage current, the luminance of a light emitting element is influenced, the display is not uniform, and the display effect is influenced.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a voltage stabilizing unit, a storage capacitor, a driving transistor and a light-emitting element;
the initialization unit is electrically connected between an initialization signal end and a first node; the initialization unit is used for providing an initialization signal of the initialization signal end to the first node in an initialization stage;
the data writing unit is electrically connected between a data signal end and the first electrode of the driving transistor; the grid electrode of the driving transistor and the first end of the storage capacitor are electrically connected to a second node; the second end of the storage capacitor is electrically connected with the power signal end; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the second node; the data writing unit is used for providing a data voltage signal of the data signal end to the second node in a data writing stage; the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the second node;
the voltage stabilizing unit is electrically connected between the first node and the second node; the voltage stabilizing unit is used for providing the potential of the first node to the second node in the initialization stage and providing the potential of the second node to the first node in the data writing stage;
the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in a light-emitting stage so as to drive the light-emitting element to emit light.
In a second aspect, an embodiment of the present invention provides a driving method for a pixel driving circuit, where the driving circuit is applied to the pixel driving circuit, and the driving method includes:
in an initialization stage, the initialization unit provides an initialization signal of the initialization signal terminal to a first node; the voltage stabilizing unit provides the potential of the first node to the second node;
in a data writing stage, the data writing unit provides a data signal of a data signal end to a second node; the threshold compensation unit compensates a threshold voltage of the driving transistor to the second node; the voltage stabilization unit supplies the potential of the second node to the first node;
in the light emitting stage, the light emitting control unit controls the driving current generated by the driving transistor to flow into the light emitting element to drive the light emitting element to emit light.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel driving circuit.
In a fourth aspect, an embodiment of the present invention further provides a display device, including the display panel.
The pixel driving circuit comprises an initialization unit, a data writing unit, a threshold compensation unit, a light emitting control unit, a voltage stabilizing unit, a storage capacitor, a driving transistor and a light emitting element; the initialization unit can provide an initialization signal to the first node in an initialization stage so as to initialize the first node; the voltage stabilizing unit can provide an initialization signal of the first node to the second node in an initialization stage so as to initialize the second node, namely, the gate electrode of the driving transistor and the storage capacitor are initialized; the data writing unit can provide a data voltage signal to the second node in a data writing phase; the threshold compensation unit can compensate the threshold voltage of the driving transistor to the second node, so that the driving current generated by the driving transistor is independent of the threshold voltage of the driving transistor, the driving current of the driving transistor is controlled by the light-emitting control unit, and when the driving current flows into the light-emitting element in the light-emitting stage, the influence of the threshold voltage fluctuation of the driving transistor on the light-emitting brightness of the light-emitting element can be avoided; meanwhile, the voltage stabilizing unit can also provide the voltage of the second node for the first node in the data writing stage, so that the potentials of the first node and the second node are kept consistent. According to the embodiment of the invention, the voltage stabilizing unit is arranged between the first node and the second node, so that the leakage current between the first node and the second node can be reduced, the influence of the leakage current on the grid voltage of the driving transistor can be avoided, the retention rate of the grid voltage of the driving transistor is improved, the driving transistor can provide stable driving current for the light-emitting element, the display uniformity is improved, and the display effect is improved.
Drawings
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 structural diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a specific circuit structure of a pixel driving circuit according to an embodiment of the invention;
fig. 4 is a driving timing diagram of a pixel driving circuit according to an embodiment of the 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 a specific circuit structure of another 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 a specific circuit structure of another pixel driving circuit according to an embodiment of the invention;
fig. 9 is a schematic flow chart of a driving method according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 11 is a block 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.
As described in the background art, in a pixel driving circuit with a compensation function in the prior art, for example, a pixel driving circuit of 7T1C (seven transistors and one capacitor), due to the characteristics of the transistors, a small current still passes through the transistors when the transistors are turned off, so that after the initialization phase is finished, an initialization signal is still written into the gate of the driving transistor, the gate voltage of the driving transistor is reduced, and the light emitting brightness of the light emitting element changes with time, thereby causing display non-uniformity.
In order to solve the above problem, an embodiment of the present invention provides a pixel driving circuit including an initialization unit, a data writing unit, a threshold compensation unit, a light emission control unit, a voltage stabilization unit, a storage capacitor, a driving transistor, and a light emitting element. The initialization unit is electrically connected between the initialization signal end and the first node; the initialization unit is used for providing an initialization signal of an initialization signal end to the first node in an initialization stage; the data writing unit is electrically connected between the data signal end and the first electrode of the driving transistor; the grid of the driving transistor and the first end of the storage capacitor are electrically connected to the second node; the second end of the storage capacitor is electrically connected with the power signal end; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the second node; the data writing unit is used for providing a data voltage signal of a data signal end for the second node in a data writing stage; the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the second node; the voltage stabilizing unit is electrically connected between the first node and the second node; the voltage stabilizing unit is used for providing the potential of the first node to the second node in an initialization stage and providing the potential of the second node to the first node in a data writing stage; the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in the light-emitting stage so as to drive the light-emitting element to emit light.
By adopting the technical scheme, the initialization unit provides an initialization signal for the first node in the initialization stage so as to initialize the first node; the voltage stabilizing unit is adopted to provide an initialization signal of the first node to the second node in an initialization stage so as to initialize the second node, namely, the grid electrode of the driving transistor and the storage capacitor are initialized; providing a data voltage signal to the second node in a data write phase through the data write unit; the threshold compensation unit is adopted to compensate the threshold voltage of the driving transistor to the second node, so that the driving current generated by the driving transistor is independent of the threshold voltage of the driving transistor, the light-emitting control unit controls the driving current of the driving transistor, and when the driving current flows into the light-emitting element in the light-emitting stage, the influence of the threshold voltage fluctuation of the driving transistor on the light-emitting brightness of the light-emitting element can be avoided; meanwhile, the voltage stabilizing unit is adopted to provide the voltage of the second node for the first node in the data writing stage, so that the potentials of the first node and the second node are kept consistent, the leakage current between the first node and the second node can be reduced, the influence of the leakage current on the grid voltage of the driving transistor is avoided, the retention rate of the grid voltage of the driving transistor is improved, the driving transistor can provide stable driving current for the light-emitting element, the display uniformity is improved, and the display effect is improved.
The above is the core idea of the present invention, and based on the embodiments of the present invention, a person skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the present invention. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention. As shown in fig. 1, the pixel driving circuit includes an initialization unit 10, a data writing unit 20, a threshold compensation unit 30, a light emission control unit (51 and 52), a voltage stabilization unit 40, a storage capacitor Cst, a driving transistor T, and a light emitting element 60. The pixel driving circuit may further include a first node N1, a second node N2, an initialization signal terminal Vref, a data signal terminal Vdata, a power signal terminal PVDD, and a low voltage signal terminal PVEE.
The initialization unit 10 is electrically connected between the initialization signal terminal Vref and the first node N1; the initialization unit 10 is configured to provide an initialization signal of the initialization signal terminal Vref to the first node N1 in an initialization phase; the data writing unit 20 is electrically connected between the data signal terminal Vdata and the first electrode T1 of the driving transistor T; the gate electrode G of the driving transistor T and the first end a of the storage capacitor Cst are electrically connected to the second node N2; the second terminal b of the storage capacitor Cst is electrically connected to the power signal terminal PVDD; the threshold compensation unit 30 is electrically connected between the second electrode T2 of the driving transistor T and a second node N2; the data writing unit 20 is configured to provide a data voltage signal of the data signal terminal Vdata to the second node N2 in the data writing phase; the threshold compensation unit 30 is for compensating the threshold voltage Vth of the driving transistor T to the second node N2; the voltage stabilizing unit 40 is electrically connected between the first node N1 and the second node N2; the voltage stabilizing unit 40 is used for providing the potential of the first node N1 to the second node N2 in the initialization phase and providing the potential of the second node N2 to the first node N1 in the data writing phase; the light emission control units (51 and 52) are electrically connected between the power signal terminal PVDD and the light emitting element 60; the light emission control unit (51 and 52) is configured to control the driving current generated by the driving transistor T to flow into the light emitting element 60 to drive the light emitting element 60 to emit light during the light emission phase.
Specifically, in the initialization stage, the initialization unit 10 and the voltage stabilization unit 40 are turned on, the initialization unit 10 provides the initialization signal of the initialization signal terminal Vref to the first node N1, and the voltage stabilization unit 40 provides the initialization signal of the first node N1 to the second node N2, so as to initialize the signal stored in the storage capacitor Cst and the gate G of the driving transistor T; in the data writing phase, the data writing unit 20, the threshold compensation unit 30 and the voltage stabilization unit 40 are all turned on, the data voltage signal of the data signal terminal Vdata is sequentially written into the second node N2, namely the first terminal of the storage capacitor Cst and the gate of the driving transistor T through the data writing unit 20, the driving transistor T and the threshold compensation unit 30, so that the gate voltage of the driving transistor T gradually increases until the voltage difference between the gate voltage of the driving transistor T and the first electrode T1 of the driving transistor T is equal to the threshold voltage of the driving transistor T, the driving transistor T is turned off, and at this time, the voltage V2 of the second node N2 is Vd- | Vth |, where Vd is the data voltage of the data signal terminal and Vth is the threshold voltage of the driving transistor; meanwhile, the voltage stabilizing unit 40 provides the voltage V2 of the second node N2 to the first node N1, so that the voltage V1 of the first node N1 and the voltage V2 of the second node N2 are kept consistent; in the light emitting stage, the light emission control unit (51 and 52) is turned on, the driving current generated by the driving transistor T flows into the light emitting element 60, and the light emitting element 60 emits light in response to the driving current.
Wherein, a voltage regulation unit 40 is disposed between the first node N1 and the second node N2, and the voltage regulation unit 40 is capable of reducing leakage current between the first node N1 and the second node N2; meanwhile, the voltages of the first node N1 and the second node N1 are kept consistent, so that the voltage regulator unit 40 is in a small bias or non-bias state, the leakage current generated by the voltage regulator unit 40 is small, and the influence of the leakage current on the voltage of the second node N2 can be reduced. Thus, the voltage holding ratio of the gate G of the driving transistor T can be increased, so that the driving transistor T can provide a stable driving current for the light emitting element 60, thereby improving the display uniformity and further improving the display effect.
In addition, the light emission control unit may include a first light emission control unit 51 and a second light emission control unit 52, and the first light emission control unit 51 is electrically connected between the power signal terminal and the first electrode T1 of the driving transistor T; the second light emission control unit 52 is electrically connected between the second electrode T2 driving the crystal light T and the first end of the light emitting element 60; the second terminal of the light emitting element 60 can be electrically connected to the low level signal terminal PVEE, so that when the first light emitting control unit 51 and the second light emitting control unit 52 are turned on in the light emitting stage, a current loop can be formed to drive the light emitting element 60 to emit light.
It should be noted that, in the embodiments of the present invention, specific structures of the initialization unit, the data writing unit, the threshold compensation unit, the voltage stabilization unit, and the light emission control unit are not specifically limited. On the premise of realizing the compensation function of the threshold voltage of the driving transistor and keeping the voltages of the first node and the second node consistent, each unit of the pixel driving circuit can be designed according to actual requirements.
Optionally, fig. 2 is a schematic structural diagram of another pixel driving circuit provided in an embodiment of the present invention. As shown in fig. 2, the control terminal of the initialization unit 10 is electrically connected to the first scan signal terminal Sn-1; the control end of the data writing unit 20 and the control end of the threshold compensation unit 30 are both electrically connected to the second scanning signal end Sn; a first control end of the voltage stabilizing unit 40 is electrically connected with the first scanning signal end Sn-1, and a second control end of the voltage stabilizing unit is electrically connected with the second scanning signal end Sn; the first scanning signal of the first scanning signal terminal Sn-1 is used for controlling the initialization unit 10 and the voltage stabilizing unit 40 to be conducted in the initialization stage; the second scan signal of the second scan signal terminal Sn is used to control the data writing unit 20, the threshold compensation unit 30 and the voltage stabilization unit 40 to be turned on during the data writing phase.
Specifically, the control terminal of the initialization unit 10 and the first control terminal of the voltage stabilizing unit 40 are both electrically connected to the first scan signal terminal Sn-1, so that the first scan signal of the first scan signal terminal Sn-1 controls the initialization unit 10 and the voltage stabilizing unit 40 to be simultaneously turned on in the initialization stage, so that in the initialization stage, the initialization signal of the initialization signal terminal Vref can be transmitted to the first node N1 through the initialization unit 10, and transmitted to the second node N2 through the voltage stabilizing unit 40, so as to initialize the gate G of the driving transistor T and the storage capacitor; the control terminal of the data writing unit 20, the control terminal of the threshold compensation unit 30, and the second control terminal of the voltage stabilization unit 40 are electrically connected to the second scan signal terminal Sn, so that the second scan signal of the second scan signal terminal Sn can control the data writing unit, the threshold compensation unit, and the voltage stabilization unit to be turned on in the data writing phase, the data voltage and the threshold voltage of the driving transistor T are written into the second node N2 and stored in the storage capacitor Cst, and the voltage of the second node N2 is transmitted to the first node N1 through the turned-on voltage stabilization unit 40, so that the voltage of the first node N1 and the voltage of the second node N2 are kept consistent. Therefore, the voltage stabilizing unit can be conducted in the initialization stage and the data writing stage without additionally arranging a control signal for the voltage stabilizing unit, and the structure of the pixel driving circuit is favorably simplified.
Optionally, fig. 3 is a schematic diagram of a specific circuit structure of a pixel driving circuit according to an embodiment of the present invention. As shown in fig. 3, the voltage stabilizing unit 40 of the pixel driving circuit includes a first transistor M1, a second transistor M2, and a stabilizing capacitor Ch; a gate of the first transistor M1 is electrically connected to the first scan signal terminal Sn-1, and a gate of the second transistor M2 is electrically connected to the second scan signal terminal Sn; a first electrode of the first transistor M1, a second electrode of the second transistor M2 and a first end of the voltage stabilizing capacitor Ch are electrically connected to a first node N1; the second end of the voltage-stabilizing capacitor Ch is electrically connected with the fixed voltage signal end; the second electrode of the first transistor M1 and the first electrode of the second transistor M2 are electrically connected to the second node N2. The fixed voltage signal terminal electrically connected to the second terminal of the voltage stabilizing capacitor Ch may be a power signal terminal PVDD.
Specifically, the gate of the first transistor M1 in the voltage regulation unit 40 is electrically connected to the first scan signal terminal Sn-1, and the gate of the second transistor M2 is electrically connected to the second scan signal terminal Sn. In this way, the first scan signal of the first scan signal terminal Sn-1 can control the first transistor M1 and the initialization unit 10 to be turned on in the initialization phase, so that the initialization unit 10 can provide the initialization signal of the initialization signal terminal Vref to the first node N1 to initialize the first node N1, i.e., initialize the voltage stabilizing capacitor Cst; meanwhile, when the first transistor M1 is turned on, the voltage of the first node N1 can be transmitted to the second node N2 to initialize the second node N2, i.e., the gate G of the driving transistor T and the storage capacitor Cst. The second scan signal of the second scan signal terminal Sn can control the data writing unit 20, the threshold compensating unit 30, and the second transistor M2 to be turned on in the data writing phase, so that the data writing unit 20 and the threshold compensating unit 30 can supply the data voltage and the threshold voltage Vth of the driving transistor T to the second node N2, so that the voltage of the second node N2 is equal to the sum Vth of the data voltage and the threshold voltage of the driving transistor, and the voltage of the second node N2 is stored in the storage capacitor Cst; meanwhile, when the second transistor M2 is turned on, it is possible to supply the voltage of the second node N2 to the first node N1 such that the voltage of the first node N1 is also equal to the sum of the data voltage and the threshold voltage Vth of the driving transistor T, and store the voltage of the first node N1 in the stabilizing capacitor Ch. At this time, the voltage stored in the storage capacitor Cst is equal to the voltage stored in the voltage stabilizing capacitor Ch, that is, the voltages of the first node N1 and the second node N2 are kept consistent, so that the leakage current between the first node N1 and the second node N2 can be reduced, the influence of the leakage current on the gate voltage of the driving transistor T is avoided, the retention ratio of the gate voltage of the driving transistor T is improved, the driving transistor T can provide a stable driving current for the light emitting element 60, the display uniformity is improved, and the display effect is improved.
Alternatively, with continued reference to fig. 3, a voltage stabilizing capacitor Ch capable of storing the voltage of the first node N1 is provided in the voltage stabilizing unit 40. In the data writing phase, the data voltage signal of the data signal terminal is written to the second node N2 until the voltage of the second node N2 is the sum of the data voltage and the threshold voltage of the driving transistor T, and the voltage of the second node N2 is stored in the storage capacitor Cst; meanwhile, the second transistor M2 of the voltage stabilizing unit 40 supplies the voltage of the second node N2 to the first node N1, so that the voltages of the first node N1 and the second node N2 are kept the same. Therefore, in the data writing phase, the storage capacitor Cst and the voltage stabilizing capacitor Ch need to be charged. The ratio N of the capacitance value of the voltage-stabilizing capacitor Ch to the capacitance value of the storage capacitor Cst is set to be 1/5-1, so that the voltage of the first node N1 is consistent with the voltage of the second node N2, the time of the data writing phase is short, and the refresh frequency of the display panel is improved. On the other hand, the stabilizing capacitor Ch can store enough charges, and the potential of the first node N1 is maintained until the charges stored in the stabilizing capacitor are consumed even if leakage current is generated in the light emitting stage, so that the potentials of N1 and N2 are always the same, and the leakage of the second node N2 is avoided.
Alternatively, with continued reference to fig. 3, the initialization unit 10 of the pixel driving circuit includes a third transistor M3; a gate electrode of the third transistor M3 is electrically connected to the first scan signal terminal Sn-1, a first electrode of the third transistor M3 is electrically connected to the initialization signal terminal Vref, and a second electrode of the third transistor M3 is electrically connected to the first node N1; the third transistor M3 and the first transistor M1 are both N-type transistors; alternatively, the third transistor M3 and the first transistor M1 are both P-type transistors.
Specifically, in the initialization stage, the third transistor M3 and the first transistor M1 are controlled to be turned on by the first scan signal of the first scan signal terminal Sn-1, and the initialization signal of the initialization signal terminal Vref is transmitted to the first node N1 through the third transistor M3 and transmitted to the second node through the first transistor M1, so as to simultaneously initialize the first node N1 and the second node N2, that is, initialize the storage capacitor Cst, the gate G of the driving transistor T, and the voltage stabilizing capacitor Ch. At this time, it is required that the first transistor M1 and the third transistor M3 are the same type of transistor, that is, the first transistor M1 and the third transistor M3 are both P-type transistors, or the first transistor M1 and the third transistor M3 are both N-type transistors.
Illustratively, when the first transistor M1 and the third transistor M3 are both P-type transistors, the P-type transistors are turned on when the first scan signal of the first scan signal terminal Sn-1 is a low-level signal, and turned off when the first scan signal of the first scan signal terminal Sn-1 is a high-level signal; when the first transistor M1 and the third transistor M3 are both N-type transistors, the N-type transistors are turned on when the first scan signal at the first scan signal terminal Sn-1 is a high-level signal, and turned off when the first scan signal at the first scan signal terminal Sn-1 is a low-level signal.
Alternatively, as shown with continued reference to fig. 3, the data writing unit 20 of the pixel driving circuit includes a fourth transistor M4, and the threshold compensating unit 40 includes a fifth transistor M5; a gate electrode of the fourth transistor M4 is electrically connected to the second scan signal terminal Sn, a first electrode of the fourth transistor M4 is electrically connected to the data signal terminal Vdata, and a second electrode of the fourth transistor M4 is electrically connected to the first electrode T1 of the driving transistor T; a gate electrode of the fifth transistor M5 is electrically connected to the second scan signal terminal Sn, a first electrode of the fifth transistor M5 is electrically connected to the second electrode of the driving transistor T, and a second electrode of the fifth transistor M5 is electrically connected to the second node N2; the second transistor M2, the fourth transistor M4 and the fifth transistor M5 are all N-type transistors; alternatively, the second transistor M2, the fourth transistor M4, and the fifth transistor M5 are all P-type transistors.
Specifically, in the initialization stage, the second scan signal of the second scan signal terminal Sn controls the second transistor M2, the fourth transistor M4 and the fifth transistor M5 to be turned on, and the data signal of the data signal terminal Vdata is written into the second node N2 through the turned-on fourth transistor M4, the driving transistor T and the fifth transistor M5 until the voltage of the second node N2 is equal to the sum of the data voltage and the threshold voltage of the driving transistor T and is stored in the storage capacitor Cst; meanwhile, the voltage of the second node N2 is transmitted to the first node N1 through the second transistor M2 such that the voltage of the first node N1 is also equal to the sum of the data voltage and the threshold voltage of the driving transistor T and is stored in the stabilizing capacitor Ch. At this time, it is required that the second transistor M2, the fourth transistor M4 and the fifth transistor M5 are transistors of the same type, that is, the second transistor M2, the fourth transistor M4 and the fifth transistor M5 are all P-type transistors, or the second transistor M2, the fourth transistor M4 and the fifth transistor M5 are all N-type transistors.
Illustratively, when the second transistor M2, the fourth transistor M4, and the fifth transistor M5 are all P-type transistors, the P-type transistors are turned on when the second scan signal of the second scan signal terminal Sn is a low level signal, and turned off when the second scan signal of the second scan signal terminal Sn is a high level signal; when the second transistor M2, the fourth transistor M4, and the fifth transistor M5 are all N-type transistors, the N-type transistors are turned on when the second scan signal of the second scan signal terminal Sn is a high-level signal, and turned off when the second scan signal of the second scan signal terminal Sn is a low-level signal.
Exemplarily, fig. 4 is a driving timing diagram of a pixel driving circuit according to an embodiment of the present invention. Referring to fig. 3 and 4, the voltage stabilizing unit 40 includes a first transistor M1, a second transistor M2, and a voltage stabilizing capacitor Ch, the initialization unit 10 includes a third transistor M3, the data writing unit 20 includes a fourth transistor M4, the threshold compensating unit 30 includes a fifth transistor M5, and the light emission controlling unit includes a seventh transistor M7 and an eighth transistor M8. Wherein, the gate of the first transistor M1 and the gate of the third transistor M3 are both electrically connected to the first scan signal terminal Sn-1; the gate of the second transistor M2, the gate of the fourth transistor M4 and the gate of the fifth transistor M5 are all electrically connected to the second scan signal terminal Sn; a gate of the seventh transistor M7 and a gate of the eighth transistor M8 are both electrically connected to the light emission control signal terminal En. When the transistors in the pixel driving circuit are all P-type transistors, the working process of the pixel driving circuit comprises the following stages:
at stage t1, i.e. at the initialization stage, the first scan signal provided by the first scan signal terminal Sn-1 is a low level signal, so that the first transistor M1 and the third transistor M3 are turned on; and the second scan signal provided from the second scan signal terminal Sn and the light emission control signal provided from the light emission control signal terminal En are both high level signals, so that the second transistor M2, the fourth transistor M4, the fifth transistor M5, the seventh transistor M7, and the eighth transistor M8 are all turned off; an initialization signal of the initialization signal terminal Vref is written into the first node N1 through the turned-on third transistor M3 to initialize the voltage stabilizing capacitor Ch; meanwhile, the initialization signal of the first node N1 is written into the second node N2 through the turned-on first transistor M1 to initialize the gate of the driving transistor T and the storage capacitor Cst. The initialization signal provided by the initialization signal terminal Vref is a low level signal, which ensures that the driving transistor T is turned on in the next stage.
At a stage t2, i.e., at a data writing stage, the second scan signal provided by the second scan signal terminal Sn is a low level signal, so that the second transistor M2, the fourth transistor M4 and the fifth transistor M5 are all turned on; the first scan signal provided from the first scan signal terminal Sn-1 and the light emission control signal provided from the light emission control signal terminal En are both high level signals such that the first transistor M1, the third transistor M3, the seventh transistor M7, and the eighth transistor M8 are all turned off; the data voltage signal of the data signal terminal Vdata is sequentially written into the second node, i.e. the gate G of the driving transistor T and the first terminal of the storage capacitor Cst, through the turned-on fourth transistor M4, the driving transistor T and the fifth transistor M5, so that the gate voltage of the driving transistor T gradually increases until the voltage difference between the gate voltage of the driving transistor T and the first electrode T1 of the driving transistor T is equal to the threshold voltage V of the driving transistor TthI.e. the voltage V2 ═ V of the second node N2d-|VthL, wherein VdThe voltage value of the data voltage signal provided for the data signal terminal; the voltage at the second node N2 is stored in the storage capacitor Cst; meanwhile, the turned-on second transistor M2 transmits the voltage of the second node N2 to the first node N1, so that the voltage V1 of the first node N1 is Vd- | Vth |, and the first crystal is turned onThe voltage of the transistor is stored in the voltage stabilizing capacitor Ch. At this time, the voltage of the first node N1 is equal to the sum of the threshold voltage and the data voltage of the driving transistor at the second node N2, and the voltage of the first end of the third transistor M3 is the initialization signal of the initialization signal terminal Vref, so that the third transistor M3 is in a biased state, and when the voltage of the first node N1 changes, the biased state of the third transistor M3 is different, so that the M3 has different threshold shift, and thus the M3 has a certain leakage current at the stage when the third transistor M3 should be turned off. However, since the first transistor M1 and the second transistor M2 are disposed between the first node N1 and the second node N2, the leakage current from the initialization signal terminal Vref to the second node N2 is reduced, so that the influence of the leakage current on the second node N2 can be prevented; meanwhile, the voltages of the first node N1 and the second node N2 are kept consistent, and the voltage difference between the two ends of the first transistor M1 and the second transistor M2 is 0 or a small voltage difference, so that the first transistor M1 and the second transistor M2 have small leakage current, and the influence of the leakage current on the second node N2 is further reduced, so that the second node N2 is kept as the sum of the data voltage and the threshold voltage of the driving transistor T under the action of the storage capacitor Cst.
At a stage t3, that is, during the light emitting stage, the light emitting control signal provided by the light emitting control signal terminal En is a low level signal, so that the seventh transistor M7 and the eighth transistor M8 are both turned on, the second scan signal provided by the second scan signal terminal Sn and the first scan signal provided by the first scan signal terminal Sn-1 are both high level signals, and the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, and the fifth transistor M5 are all turned off; power supply signal V of power supply signal terminal PVDDpvddThe first electrode T1 of the driving transistor T is written through the turned-on seventh transistor M7, and the voltage difference V between the first electrode T1 of the driving transistor T1 and the gate of the driving transistor T is then obtainedsg＝Vpvdd-Vd+|VthI.e., the drain current of the driving transistor T, i.e., the driving current generated by the driving transistor T flows into the light emitting element 60 through the eighth transistor M2, the light emitting element 60 is driven to emit light, and the driving current IdComprises the following steps:
Figure BDA0002256644010000161
as can be seen, the driving transistor T generates the driving current IdAnd the threshold voltage V of the driving transistor TthIs irrelevant. The threshold voltage compensation of the driving transistor T is realized, and the problem of display abnormity caused by threshold voltage drift of the driving transistor T is solved. Meanwhile, the first transistor M1 and the second transistor M2 are arranged between the first node N1 and the second node N2, and the voltage stabilizing capacitor Ch is added at the first node N1, so that the leakage current from the initialization signal terminal Vref to the second node N2 can be reduced, the voltage of the first node N1 can be kept consistent with the voltage of the second node N2, the leakage current generated by the first transistor M1 and the second transistor M2 can be further reduced, the retention ratio of the gate voltage of the driving transistor T can be improved, the stability of the light-emitting brightness of the light-emitting element 60 can be improved, and the display effect can be improved.
It should be noted that fig. 4 of the present embodiment is only a driving timing chart when all the transistors in the pixel driving circuit are P-type transistors, and in general, the P-type transistors are turned on under the control of a low-level signal and turned off under the control of a high-level signal. In some alternative embodiments, the transistors in the pixel driving circuit may also be all N-type transistors, and generally the N-type transistors are turned on under the control of a high-level signal and turned off under the control of a low-level signal. The embodiment of the present invention does not specifically limit the types of transistors in the pixel driving circuit.
Optionally, with continued reference to fig. 3, the width-to-length ratio W of the third transistor M33/L3Is smaller than the width-to-length ratio W of the first transistor M11/L1And/or the width-to-length ratio W of the second transistor M22/L2. As such, the third transistor M3 can have a smaller width-to-length ratio W3/L3The leakage current generated by the third transistor M3 is small, so that the leakage current can be prevented from affecting the voltage of the first node N1, the voltage of the first node N1 can be kept consistent with the voltage of the second node N2, and the influence of the leakage current on the second node N2 is reduced, namely the influence of the leakage current on the driving is reducedThe influence of the gate voltage of the transistor T enables the driving current generated by the driving transistor T to drive the light emitting element 60 to stably emit light.
Optionally, fig. 5 is a schematic structural diagram of another pixel driving circuit provided in an embodiment of the present invention. As shown in fig. 5, the light emission control unit of the pixel driving circuit may include a first light emission control unit 51 and a second light emission control unit 52. The control end of the first light-emitting control unit 51, the control end of the second light-emitting control unit 52 and the control end of the voltage stabilizing unit 40 are all electrically connected with the light-emitting control signal end En; the light-emitting control signal of the light-emitting control signal terminal En controls the voltage stabilizing unit 40 to be turned on in the initialization stage and the data writing stage, and the light-emitting control signal of the light-emitting control signal terminal En controls the first light-emitting control unit 51 and the second light-emitting control unit 52 to be turned on in the light-emitting stage.
Specifically, the light emission control signal of the light emission control signal terminal En controls the voltage stabilizing unit 40 to be turned on and controls the first and second light emission control units 51 and 52 to be turned off in the initialization stage and the data writing stage, so that the first and second nodes N1 and N2 can be initialized in the initialization stage and the data voltage signal of the data signal terminal is written in the second and first nodes N2 and N1 in the data writing stage; in the light emitting stage, the light emitting control signal of the light emitting control signal terminal En controls the voltage stabilizing unit 40 to be turned off, and controls the first light emitting control unit 51 and the second light emitting control unit 52 to be turned on, so that the driving current generated by the driving transistor T can flow into the light emitting element 60 to drive the light emitting element 60 to stably emit light. Therefore, the function of the pixel driving circuit can be realized without additionally arranging a control signal for the voltage stabilizing unit, so that the pixel driving circuit can be simplified, and the cost of the display panel is favorably reduced.
Optionally, fig. 6 is a schematic diagram of a specific circuit structure of another pixel driving circuit according to an embodiment of the present invention. As shown in fig. 6, the voltage stabilization unit 40 includes a sixth transistor M6 and a stabilization capacitor Ch; a gate of the sixth transistor M6 is electrically connected to the light emission control signal terminal En, a first electrode of the sixth transistor M6 is electrically connected to the first node N1, and a second electrode of the sixth transistor M6 is electrically connected to the second node N2; a first end of the voltage stabilizing capacitor Ch is electrically connected to the first node N2, and a second end of the voltage stabilizing capacitor Ch is electrically connected to the fixed voltage signal terminal. The fixed voltage signal terminal electrically connected to the second terminal of the voltage stabilizing capacitor Ch may be a power signal terminal.
Specifically, the gate of the sixth transistor M6 of the voltage regulation unit is electrically connected to the light emission control signal terminal En, and the light emission control signal of the light emission control signal terminal En can control the sixth transistor M6 to be turned on in both the initialization phase and the data writing phase, so that in the initialization phase, when the initialization unit 10 provides the initialization signal of the initialization signal terminal Vref to the first node N1, the sixth transistor M6 can provide the initialization signal of the first node N1 to the second node N2 to initialize the gate G of the driving transistor T; meanwhile, in the data writing phase, when the data writing unit 20 and the threshold compensating unit write the data voltage and the threshold voltage of the driving transistor T into the second node N2, the sixth transistor M6 can transmit the voltage of the second node N2 to the first node N1 and store in the stabilizing capacitor Ch. At this time, the voltage stored in the storage capacitor Cst is equal to the voltage stored in the voltage stabilizing capacitor Ch, that is, the voltages of the first node N1 and the second node N2 are kept consistent, so that the leakage current between the first node N1 and the second node N2 can be reduced, the influence of the leakage current on the gate voltage of the driving transistor T is avoided, the retention ratio of the gate voltage of the driving transistor T is improved, the driving transistor T can provide a stable driving current for the light emitting element 60, the display uniformity is improved, and the display effect is improved.
The capacitance value ratio N between the voltage stabilizing capacitor Ch and the storage capacitor Cst of the voltage stabilizing unit 40 is set to be 1/5 ≤ N ≤ 1, so that the voltage of the first node N1 can be kept consistent with the voltage of the second node N2 by the voltage stabilizing capacitor Ch, and the elapsed time of the data writing stage can be shortened, thereby improving the refresh frequency of the display panel.
Alternatively, with continued reference to fig. 6, the first light emission control unit 51 includes a seventh transistor M7, and the second light emission control unit 52 includes an eighth transistor M8; a gate of the seventh transistor M7 is electrically connected to the emission control signal terminal En, a first electrode of the seventh transistor M7 is electrically connected to the power signal terminal PVDD, and a second electrode of the seventh transistor M7 is electrically connected to the first electrode of the driving transistor T; a gate of the eighth transistor M8 is electrically connected to the light emission control signal terminal En, a first electrode of the eighth transistor M8 is electrically connected to the second electrode of the driving transistor T, and a second electrode of the eighth transistor M8 is electrically connected to the light emitting element 60; the sixth transistor M6 is an N-type transistor, and the seventh transistor M7 and the eighth transistor M8 are both P-type transistors; alternatively, the sixth transistor M6 is a P-type transistor, and the seventh transistor M7 and the eighth transistor M8 are both N-type transistors.
Specifically, the light emitting control signal of the light emitting control signal terminal EN controls the sixth transistor M6 to be turned on during the initialization phase and the data writing phase, and at this time, the seventh transistor M7 and the eighth transistor M8 are turned off; meanwhile, the light emitting control signal of the light emitting control signal terminal EN also controls the seventh transistor M7 and the eighth transistor M8 to be turned on in the light emitting period, and at this time, the sixth transistor M6 is turned off. That is, the light emitting control signal of the light emitting control signal terminal EN needs to control the sixth transistor M6 and the seventh transistor M7 and the eighth transistor M8 to be turned on at different stages, so that the sixth transistor M6 and the seventh transistor M7 and the eighth transistor M8 need to be different types of transistors, that is, the sixth transistor M6 is an N-type transistor, and the seventh transistor M7 and the eighth transistor M8 are both P-type transistors; alternatively, the sixth transistor M6 is a P-type transistor, and the seventh transistor M7 and the eighth transistor M8 are both N-type transistors.
Illustratively, in the initialization phase and the data writing phase, the light emitting control signal of the light emitting control signal terminal EN is a high level signal, which can control the sixth transistor M6 of the N-type to be turned on, and control the seventh transistor M7 and the eighth transistor M8 of the P-type to be turned off; in the light emitting phase, the light emitting control signal of the light emitting control signal terminal EN is a low level signal, and the P-type seventh transistor M7 and the eighth transistor M8 can be controlled to be turned on, and the N-type sixth transistor M6 can be controlled to be turned off.
Or, in the initialization phase and the data writing phase, the light emitting control signal of the light emitting control signal terminal EN is a low level signal, which can control the P-type sixth transistor M6 to be turned on, and control the N-type seventh transistor M7 and the eighth transistor M8 to be turned off; in the light emitting phase, the light emitting control signal of the light emitting control signal terminal EN is a high level signal, and the seventh transistor M7 and the eighth transistor M8 of the N-type can be controlled to be turned on, and the sixth transistor M6 of the P-type can be controlled to be turned off.
Illustratively, the voltage stabilization unit 40 includes a sixth transistor M6 and a voltage stabilization capacitor Ch, the initialization unit 10 includes a third transistor M3, the data writing unit 20 includes a fourth transistor M4, the threshold compensation unit 30 includes a fifth transistor M5, and the light emission control unit includes a seventh transistor M7 and an eighth transistor M8. The gate of the third transistor M3 is electrically connected to the first scan signal terminal Sn-1; the gate of the fourth transistor M4 and the gate of the fifth transistor M5 are both electrically connected to the second scan signal terminal Sn; the gate of the sixth transistor M6, the gate of the seventh transistor M7, and the gate of the eighth transistor M8 are all electrically connected to the light emission control signal terminal En. When the sixth transistor in the pixel driving circuit is an N-type transistor and the other transistors are P-type transistors, the working timing of the pixel driving circuit is as shown in fig. 4, and the specific working process thereof can refer to the working process described above in the embodiment of the present invention, and will not be described herein again.
Optionally, fig. 7 is a schematic structural diagram of another pixel driving circuit provided in an embodiment of the present invention. As shown in fig. 7, on the basis of the above embodiment, the pixel driving circuit further includes a reset unit 70; the reset unit 70 is electrically connected between the initialization signal terminal Vref and the first terminal of the light emitting element 60; the second terminal of the light emitting element 60 is electrically connected to the low level signal terminal PVEE; the reset unit 70 is configured to provide an initialization signal of the initialization signal terminal Vref to the first terminal of the light emitting element 60 to initialize the first terminal of the light emitting element 60 before the light emitting period.
Optionally, fig. 8 is a schematic diagram of a specific circuit structure of another pixel driving circuit according to an embodiment of the present invention. As shown in fig. 8, the reset unit 70 may include a ninth transistor M9; a first electrode of the ninth transistor M9 is electrically connected to the initialization signal terminal Vref, a second electrode of the ninth transistor M9 is electrically connected to the first terminal of the light emitting element 60, and a gate of the ninth transistor M9 may be electrically connected to the first scan signal terminal Sn-1 or the second scan signal terminal Sn. The ninth transistor M9 writes the initialization signal of the initialization signal terminal Vref to the first terminal of the light emitting element 60 in the initialization stage or the reset stage, initializes the potential of the first terminal of the light emitting element 60, reduces the influence of the voltage of the first terminal of the light emitting element 60 in the previous frame on the voltage of the first terminal of the light emitting element 60 in the subsequent frame, and improves the uniformity of display.
The embodiment of the invention also provides a driving method of the pixel driving circuit, and the driving method of the pixel driving circuit can be applied to the pixel driving circuit provided by the embodiment of the invention. Fig. 9 is a flowchart illustrating a driving method of a pixel driving circuit according to an embodiment of the invention. As shown in fig. 9, the driving method includes:
s901, in an initialization stage, an initialization unit provides an initialization signal of an initialization signal end to a first node; the voltage stabilizing unit provides the potential of the first node to the second node;
s902, in a data writing stage, a data writing unit provides a data signal of a data signal end to the second node; the threshold compensation unit compensates the threshold voltage of the driving transistor to the second node; the voltage stabilization unit supplies the potential of the second node to the first node;
and S903, in a light-emitting stage, controlling the driving current generated by the driving transistor to flow into a light-emitting element by the light-emitting control unit so as to drive the light-emitting element to emit light.
Illustratively, the driving method of the pixel driving circuit provided by the embodiment of the invention is used for the pixel driving circuit shown in fig. 1. As shown in fig. 1, in the initialization stage, the initialization unit 10 and the voltage stabilizing unit 40 are both turned on, the initialization signal of the initialization signal terminal Vref is written into the first node N1 through the initialization unit 10 to initialize the first node N1, and simultaneously the initialization signal of the first node N1 is transmitted to the second node N2 through the voltage stabilizing unit 40 to initialize the gate of the driving transistor T and the storage capacitor Cst; in the data writing stage, the data writing unit 20, the threshold compensation unit 30 and the voltage stabilization unit 40 are all turned on, the data voltage signal of the data signal terminal Vdata is written into the second stage N2 sequentially through the turned-on data writing unit 20, the driving transistor T and the threshold compensation unit 30 until the voltage of the second node N2 is equal to the sum of the threshold voltage of the driving transistor and the data voltage, and meanwhile, the voltage of the second node N2 is transmitted to the first node N1 through the voltage stabilization unit 40, so that the voltage of the first node N1 is consistent with the voltage of the second node N2; in the light emitting stage, the light emitting control units 51 and 52 are turned on, the driving transistor T generates a driving current, and the light emitting element 60 is driven to stably emit light through the turned-on light emitting control units 51 and 52.
According to the embodiment of the invention, the voltage stabilizing unit is adopted to provide the initialization signal of the first node for the second node in the initialization stage, and the voltage stabilizing unit is adopted to provide the voltage of the second node for the first node in the data writing stage, so that the potentials of the first node and the second node are kept consistent, the leakage current between the first node and the second node can be reduced, the influence of the leakage current on the grid voltage of the driving transistor is avoided, the retention rate of the grid voltage of the driving transistor is improved, the driving transistor can provide stable driving current for the light-emitting element, the display uniformity is improved, and the display effect is further improved.
Embodiments of the present invention further provide a display panel, where the display panel includes the pixel driving circuit provided in the embodiments of the present invention, so that the display panel has the beneficial effects of the pixel driving circuit provided in the embodiments of the present invention, and the same points can be understood with reference to the above description, and details are not described herein again.
For example, fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 10, the display panel 100 includes a plurality of pixels 101 arranged in an array, each pixel 101 includes a light emitting element and a pixel driving circuit provided in the embodiment of the present invention, and the pixel driving circuit can drive the light emitting element to emit light, so that the display panel 100 can display a corresponding image.
The embodiment of the present invention further provides a display device, which includes the display panel provided by the embodiment of the present invention, and therefore, the display device also has the beneficial effects of the display panel provided by the embodiment of the present invention, and the same points can be understood with reference to the above description, and the details are not described herein again.
For example, fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 11, a display device 200 according to an embodiment of the present invention includes the display panel 100 according to an embodiment of the present invention. The display device 200 may be any electronic device having a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television.
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 described 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 (15)

1. A pixel driving circuit, comprising: the device comprises an initialization unit, a data writing unit, a threshold compensation unit, a light-emitting control unit, a voltage stabilizing unit, a storage capacitor, a driving transistor and a light-emitting element;
the initialization unit is electrically connected between an initialization signal end and a first node; the initialization unit is used for providing an initialization signal of the initialization signal end to the first node in an initialization stage;
the data writing unit is electrically connected between a data signal end and the first electrode of the driving transistor; the grid electrode of the driving transistor and the first end of the storage capacitor are electrically connected to a second node; the second end of the storage capacitor is electrically connected with the power signal end; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the second node; the data writing unit is used for providing a data voltage signal of the data signal end to the second node in a data writing stage; the threshold compensation unit is used for compensating the threshold voltage of the driving transistor to the second node;
the voltage stabilizing unit is electrically connected between the first node and the second node; the voltage stabilizing unit is used for providing the potential of the first node to the second node in the initialization stage and providing the potential of the second node to the first node in the data writing stage;
the light-emitting control unit is electrically connected between the power signal end and the light-emitting element; the light-emitting control unit is used for controlling the driving current generated by the driving transistor to flow into the light-emitting element in a light-emitting stage so as to drive the light-emitting element to emit light.
2. The pixel driving circuit according to claim 1, wherein the control terminal of the initialization unit is electrically connected to the first scan signal terminal; the control end of the data writing unit and the control end of the threshold compensation unit are both electrically connected with a second scanning signal end; the first control end of the voltage stabilizing unit is electrically connected with the first scanning signal end, and the second control end of the voltage stabilizing unit is electrically connected with the second scanning signal end;
the first scanning signal of the first scanning signal end is used for controlling the initialization unit and the voltage stabilizing unit to be conducted in the initialization stage; the second scanning signal of the second scanning signal terminal is used for controlling the data writing unit, the threshold compensation unit and the voltage stabilization unit to be conducted in the data writing stage.
3. The pixel driving circuit according to claim 2, wherein the voltage stabilization unit includes a first transistor, a second transistor, and a voltage stabilization capacitor;
the grid electrode of the first transistor is electrically connected with the first scanning signal end, and the grid electrode of the second transistor is electrically connected with the second scanning signal end;
a first electrode of the first transistor, a second electrode of the second transistor and a first end of the voltage stabilizing capacitor are electrically connected to the first node; the second end of the voltage stabilizing capacitor is electrically connected with the fixed voltage signal end;
the second electrode of the first transistor and the first electrode of the second transistor are electrically connected to the second node.
4. The pixel driving circuit according to claim 3, wherein the initialization unit includes a third transistor;
a gate of the third transistor is electrically connected to the first scan signal terminal, a first electrode of the third transistor is electrically connected to the initialization signal terminal, and a second electrode of the third transistor is electrically connected to the first node;
the third transistor and the first transistor are both N-type transistors; alternatively, the third transistor and the first transistor are both P-type transistors.
5. The pixel driving circuit according to claim 4, wherein a width-to-length ratio of the third transistor is smaller than a width-to-length ratio of the first transistor and/or a width-to-length ratio of the second transistor.
6. The pixel driving circuit according to claim 3, wherein the data writing unit includes a fourth transistor, and the threshold compensation unit includes a fifth transistor;
a gate of the fourth transistor is electrically connected to the second scan signal terminal, a first electrode of the fourth transistor is electrically connected to the data signal terminal, and a second electrode of the fourth transistor is electrically connected to the first electrode of the driving transistor;
a gate of the fifth transistor is electrically connected to the second scan signal terminal, a first electrode of the fifth transistor is electrically connected to the second electrode of the driving transistor, and a second electrode of the fifth transistor is electrically connected to the second node;
the second transistor, the fourth transistor and the fifth transistor are all N-type transistors; or, the second transistor, the fourth transistor, and the fifth transistor are all P-type transistors.
7. The pixel driving circuit according to claim 1, wherein the light emission control unit includes a first light emission control unit and a second light emission control unit; the control end of the first light-emitting control unit, the control end of the second light-emitting control unit and the control end of the voltage stabilizing unit are electrically connected with a light-emitting control signal end;
the light-emitting control signal of the light-emitting control signal end controls the voltage stabilizing unit to be conducted in the initialization stage and the data writing stage, and the light-emitting control signal of the light-emitting control signal end controls the first light-emitting control unit and the second light-emitting control unit to be conducted in the light-emitting stage.
8. The pixel driving circuit according to claim 7, wherein the voltage stabilization unit includes a sixth transistor and a voltage stabilization capacitor;
a gate of the sixth transistor is electrically connected to the light emission control signal terminal, a first electrode of the sixth transistor is electrically connected to the first node, and a second electrode of the sixth transistor is electrically connected to the second node;
the first end of the voltage-stabilizing capacitor is electrically connected to the first node, and the second end of the voltage-stabilizing capacitor is electrically connected to the fixed voltage signal end.
9. The pixel driving circuit according to claim 8, wherein the first light emission control unit includes a seventh transistor, and wherein the second light emission control unit includes an eighth transistor;
a grid electrode of the seventh transistor is electrically connected with the light-emitting control signal end, a first electrode of the seventh transistor is electrically connected with the power signal end, and a second electrode of the seventh transistor is electrically connected with the first electrode of the driving transistor;
a gate of the eighth transistor is electrically connected to the light-emitting control signal terminal, a first electrode of the eighth transistor is electrically connected to the second electrode of the driving transistor, and a second electrode of the eighth transistor is electrically connected to the light-emitting element;
the sixth transistor is an N-type transistor, and the seventh transistor and the eighth transistor are both P-type transistors; or, the sixth transistor is a P-type transistor, and the seventh transistor and the eighth transistor are both N-type transistors.
10. The pixel driving circuit according to claim 3 or 8, wherein a ratio of a capacitance value of the voltage stabilizing capacitor to a capacitance value of the storage capacitor is n; wherein, the value range of n is as follows: 1/5 is less than or equal to n is less than or equal to 1.
11. The pixel driving circuit according to any one of claims 1 to 9, further comprising a reset unit;
the reset unit is electrically connected between the initialization signal end and the first end of the light-emitting element; the second end of the light-emitting element is electrically connected with the low-level signal end; the reset unit is used for providing an initialization signal of the initialization signal terminal to the first terminal of the light-emitting element before the light-emitting phase.
12. The pixel driving circuit according to claim 11, wherein the reset unit includes a ninth transistor;
a gate of the ninth transistor is electrically connected to a first scan signal terminal, a first electrode of the ninth transistor is electrically connected to the initialization signal terminal, and a second electrode of the ninth transistor is electrically connected to the first terminal of the light emitting element.
13. A driving method of a pixel driving circuit, applied to the pixel driving circuit according to any one of claims 1 to 12, the driving method comprising:
in an initialization stage, the initialization unit provides an initialization signal of the initialization signal terminal to a first node; the voltage stabilizing unit provides the potential of the first node to the second node;
in a data writing stage, the data writing unit provides a data signal of a data signal end to a second node; the threshold compensation unit compensates a threshold voltage of the driving transistor to the second node; the voltage stabilization unit supplies the potential of the second node to the first node;
in the light emitting stage, the light emitting control unit controls the driving current generated by the driving transistor to flow into the light emitting element to drive the light emitting element to emit light.
14. A display panel comprising the pixel driving circuit according to any one of claims 1 to 12.
15. A display device characterized by comprising the display panel according to claim 14.
CN201911056337.3A 2019-10-31 2019-10-31 Pixel driving circuit, driving method thereof, display panel and display device Active CN110751927B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911056337.3A CN110751927B (en) 2019-10-31 2019-10-31 Pixel driving circuit, driving method thereof, display panel and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911056337.3A CN110751927B (en) 2019-10-31 2019-10-31 Pixel driving circuit, driving method thereof, display panel and display device

Publications (2)

Publication Number Publication Date
CN110751927A true CN110751927A (en) 2020-02-04
CN110751927B CN110751927B (en) 2021-10-26

Family

ID=69281681

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911056337.3A Active CN110751927B (en) 2019-10-31 2019-10-31 Pixel driving circuit, driving method thereof, display panel and display device

Country Status (1)

Country Link
CN (1) CN110751927B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111402809A (en) * 2020-05-27 2020-07-10 上海天马有机发光显示技术有限公司 Display panel and display device
CN111445857A (en) * 2020-04-17 2020-07-24 上海天马有机发光显示技术有限公司 Pixel driving circuit, driving method thereof and display device
CN111489701A (en) * 2020-05-29 2020-08-04 上海天马有机发光显示技术有限公司 Array substrate, driving method thereof, display panel and display device
CN112259050A (en) * 2020-10-30 2021-01-22 上海天马有机发光显示技术有限公司 Display panel, driving method thereof and display device
CN112735314A (en) * 2020-12-30 2021-04-30 合肥维信诺科技有限公司 Pixel circuit, driving method thereof, display panel and display device
CN112992055A (en) * 2021-04-27 2021-06-18 武汉华星光电半导体显示技术有限公司 Pixel circuit and display panel
CN112992040A (en) * 2021-04-13 2021-06-18 成都天马微电子有限公司 Adjusting circuit and display device
CN113012642A (en) * 2021-03-04 2021-06-22 京东方科技集团股份有限公司 Pixel circuit, display panel and driving method
CN113053319A (en) * 2021-03-19 2021-06-29 京东方科技集团股份有限公司 Pixel driving circuit, driving method thereof and display device
CN113112963A (en) * 2021-04-20 2021-07-13 合肥京东方卓印科技有限公司 Pixel driving circuit, driving backboard, manufacturing method of driving backboard and display device
CN113470574A (en) * 2021-06-11 2021-10-01 云谷（固安）科技有限公司 Pixel circuit, driving method thereof and display panel
CN113516952A (en) * 2021-05-26 2021-10-19 京东方科技集团股份有限公司 Pixel driving circuit, driving method thereof and display panel
CN113748454A (en) * 2020-03-31 2021-12-03 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display panel
CN114822395A (en) * 2022-05-07 2022-07-29 武汉华星光电半导体显示技术有限公司 Display panel
WO2022198480A1 (en) * 2021-03-24 2022-09-29 京东方科技集团股份有限公司 Array substrate and display panel comprising same, and display apparatus
US20230351958A1 (en) * 2021-02-10 2023-11-02 Boe Technology Group Co., Ltd. Array substrate, display panel comprising the array substrate, and display device
WO2024060355A1 (en) * 2022-09-22 2024-03-28 昆山国显光电有限公司 Pixel circuit and driving method therefor, and display panel

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080022695A (en) * 2006-09-07 2008-03-12 재단법인서울대학교산학협력재단 Picture element structure of display device and driving method
CN101303825A (en) * 2007-05-09 2008-11-12 索尼株式会社 Pixel circuit and display device
CN104299570A (en) * 2014-11-03 2015-01-21 厦门天马微电子有限公司 Pixel circuit, drive method thereof, array substrate and display panel
CN104658470A (en) * 2013-11-22 2015-05-27 上海和辉光电有限公司 Oled pixel circuit
CN104933993A (en) * 2015-07-17 2015-09-23 合肥鑫晟光电科技有限公司 Pixel driving circuit and driving method thereof and display device
US20160372037A1 (en) * 2015-06-16 2016-12-22 Samsung Display Co., Ltd. Pixel and organic light emitting display device using the same
CN106782324A (en) * 2017-02-17 2017-05-31 京东方科技集团股份有限公司 Image element circuit and its driving method, display device
CN107665672A (en) * 2016-07-27 2018-02-06 上海和辉光电有限公司 Image element circuit and its driving method
KR20180078933A (en) * 2016-12-30 2018-07-10 엘지디스플레이 주식회사 organic light emitting diode display device
WO2018166312A1 (en) * 2017-03-13 2018-09-20 京东方科技集团股份有限公司 Pixel circuit, driving method therefor and display device
CN109785797A (en) * 2019-03-14 2019-05-21 电子科技大学 A kind of novel AMOLED pixel circuit
CN110047431A (en) * 2019-04-29 2019-07-23 云谷（固安）科技有限公司 Pixel-driving circuit and its driving method
WO2019186765A1 (en) * 2018-03-28 2019-10-03 シャープ株式会社 Display device and method for driving same

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080022695A (en) * 2006-09-07 2008-03-12 재단법인서울대학교산학협력재단 Picture element structure of display device and driving method
CN101303825A (en) * 2007-05-09 2008-11-12 索尼株式会社 Pixel circuit and display device
CN104658470A (en) * 2013-11-22 2015-05-27 上海和辉光电有限公司 Oled pixel circuit
CN104299570A (en) * 2014-11-03 2015-01-21 厦门天马微电子有限公司 Pixel circuit, drive method thereof, array substrate and display panel
US20160372037A1 (en) * 2015-06-16 2016-12-22 Samsung Display Co., Ltd. Pixel and organic light emitting display device using the same
CN104933993A (en) * 2015-07-17 2015-09-23 合肥鑫晟光电科技有限公司 Pixel driving circuit and driving method thereof and display device
CN107665672A (en) * 2016-07-27 2018-02-06 上海和辉光电有限公司 Image element circuit and its driving method
KR20180078933A (en) * 2016-12-30 2018-07-10 엘지디스플레이 주식회사 organic light emitting diode display device
CN106782324A (en) * 2017-02-17 2017-05-31 京东方科技集团股份有限公司 Image element circuit and its driving method, display device
WO2018166312A1 (en) * 2017-03-13 2018-09-20 京东方科技集团股份有限公司 Pixel circuit, driving method therefor and display device
WO2019186765A1 (en) * 2018-03-28 2019-10-03 シャープ株式会社 Display device and method for driving same
CN109785797A (en) * 2019-03-14 2019-05-21 电子科技大学 A kind of novel AMOLED pixel circuit
CN110047431A (en) * 2019-04-29 2019-07-23 云谷（固安）科技有限公司 Pixel-driving circuit and its driving method

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113748454B (en) * 2020-03-31 2023-10-24 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display panel
CN113748454A (en) * 2020-03-31 2021-12-03 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display panel
CN111445857A (en) * 2020-04-17 2020-07-24 上海天马有机发光显示技术有限公司 Pixel driving circuit, driving method thereof and display device
CN111402809A (en) * 2020-05-27 2020-07-10 上海天马有机发光显示技术有限公司 Display panel and display device
CN111489701A (en) * 2020-05-29 2020-08-04 上海天马有机发光显示技术有限公司 Array substrate, driving method thereof, display panel and display device
CN111489701B (en) * 2020-05-29 2021-09-14 上海天马有机发光显示技术有限公司 Array substrate, driving method thereof, display panel and display device
CN112259050A (en) * 2020-10-30 2021-01-22 上海天马有机发光显示技术有限公司 Display panel, driving method thereof and display device
US11450274B2 (en) 2020-10-30 2022-09-20 Wuhan Tianma Microelectronics Co., Ltd. Display panel, driving method of display panel, and display device
US11869402B2 (en) 2020-12-30 2024-01-09 Hefei Visionox Technology Co., Ltd. Pixel circuit and display panel thereof
WO2022142559A1 (en) * 2020-12-30 2022-07-07 合肥维信诺科技有限公司 Pixel circuit and display panel thereof
CN112735314A (en) * 2020-12-30 2021-04-30 合肥维信诺科技有限公司 Pixel circuit, driving method thereof, display panel and display device
US20230351958A1 (en) * 2021-02-10 2023-11-02 Boe Technology Group Co., Ltd. Array substrate, display panel comprising the array substrate, and display device
CN113012642A (en) * 2021-03-04 2021-06-22 京东方科技集团股份有限公司 Pixel circuit, display panel and driving method
CN113053319A (en) * 2021-03-19 2021-06-29 京东方科技集团股份有限公司 Pixel driving circuit, driving method thereof and display device
US20230351956A1 (en) * 2021-03-24 2023-11-02 Boe Technology Group Co., Ltd. Array substrate, display panel and display device thereof
US11978396B2 (en) * 2021-03-24 2024-05-07 Boe Technology Group Co., Ltd. Array substrate, display panel and display device thereof
WO2022198480A1 (en) * 2021-03-24 2022-09-29 京东方科技集团股份有限公司 Array substrate and display panel comprising same, and display apparatus
CN112992040A (en) * 2021-04-13 2021-06-18 成都天马微电子有限公司 Adjusting circuit and display device
CN113112963B (en) * 2021-04-20 2023-02-28 合肥京东方卓印科技有限公司 Pixel driving circuit, driving backboard, manufacturing method of driving backboard and display device
CN113112963A (en) * 2021-04-20 2021-07-13 合肥京东方卓印科技有限公司 Pixel driving circuit, driving backboard, manufacturing method of driving backboard and display device
WO2022227231A1 (en) * 2021-04-27 2022-11-03 武汉华星光电半导体显示技术有限公司 Pixel circuit and display panel
CN112992055B (en) * 2021-04-27 2021-07-27 武汉华星光电半导体显示技术有限公司 Pixel circuit and display panel
CN112992055A (en) * 2021-04-27 2021-06-18 武汉华星光电半导体显示技术有限公司 Pixel circuit and display panel
CN113516952A (en) * 2021-05-26 2021-10-19 京东方科技集团股份有限公司 Pixel driving circuit, driving method thereof and display panel
CN113470574A (en) * 2021-06-11 2021-10-01 云谷（固安）科技有限公司 Pixel circuit, driving method thereof and display panel
CN114822395A (en) * 2022-05-07 2022-07-29 武汉华星光电半导体显示技术有限公司 Display panel
WO2024060355A1 (en) * 2022-09-22 2024-03-28 昆山国显光电有限公司 Pixel circuit and driving method therefor, and display panel

Also Published As

Publication number Publication date
CN110751927B (en) 2021-10-26

Similar Documents

Publication Publication Date Title
CN110751927B (en) Pixel driving circuit, driving method thereof, display panel and display device
CN113192460B (en) Display panel and display device
CN108206008B (en) Pixel circuit, driving method, electroluminescent display panel and display device
CN108847186B (en) Pixel circuit, driving method thereof, display panel and display device
CN113299230B (en) Pixel driving circuit, driving method of pixel driving circuit and display panel
US11404003B2 (en) Pixel and a display device having the same
US11189228B2 (en) Pixel circuit, method for driving pixel circuit, and display device
CN111105751B (en) Display device, method for driving the same, and electronic apparatus
CN109801592B (en) Pixel circuit, driving method thereof and display substrate
CN112509523B (en) Display panel, driving method and display device
CN114038420B (en) Display panel and display device
CN110164375B (en) Pixel compensation circuit, driving method, electroluminescent display panel and display device
CN111696473A (en) Pixel driving circuit, driving method of pixel driving circuit and display panel
CN112837654A (en) Pixel circuit, driving method thereof, display panel and display device
CN109389937B (en) Pixel circuit, display device and driving method of pixel circuit
CN114495836B (en) Pixel circuit, driving method thereof, display panel and electronic equipment
KR20130002115A (en) Driving circuit for organic light emitting diode display and method for driving the same
CN113990257B (en) Pixel circuit, driving method and display device
CN112669775B (en) Display panel, driving method and display device
CN108470541B (en) Pixel circuit, driving method thereof, display panel and display device
CN113748454B (en) Pixel circuit, driving method thereof and display panel
CN116363998A (en) Display panel and display device
JP2013033253A (en) Display system
KR101699045B1 (en) Organic Light Emitting Display and Driving Method Thereof
CN113077761B (en) Pixel circuit, pixel driving method and display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20211108

Address after: No.8, liufangyuan Henglu, Donghu New Technology Development Zone, Wuhan City, Hubei Province

Patentee after: WUHAN TIANMA MICROELECTRONICS Co.,Ltd.

Patentee after: Wuhan Tianma Microelectronics Co.,Ltd. Shanghai Branch

Address before: Room 509, building 1, No. 6111, Longdong Avenue, Pudong New Area, Shanghai, 200120

Patentee before: SHANGHAI TIANMA AM-OLED Co.,Ltd.

TR01 Transfer of patent right